fix(amethyst): use https in preview data and image-URL placeholders

Clears Sonar 'Using HTTP protocol is insecure' hits. None were real requests:
six are @Preview dummy strings, four are picture-URL field hints that
suggested http:// to users. The Namecoin RPC onion placeholder stays
http:// on purpose (Tor encrypts; Namecoin Core RPC has no TLS).

amethyst/src/main/java/com/vitorpamplona/amethyst/service/playback/composable/controls/RenderTopButtons.kt

@@ -87,7 +87,7 @@ fun RenderTopButtonsPreview() {
     ThemeComparisonColumn {
         Box(Modifier.background(BitcoinOrange)) {
             RenderTopButtons(
-                mediaData = MediaItemData("http://test.mp4"),
+                mediaData = MediaItemData("https://test.mp4"),
                 hasMultipleQualities = false,
                 qualityButton = {},
                 controllerVisible = remember { mutableStateOf(true) },

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/bookmarkgroups/list/metadata/BookmarkGroupMetadataScreen.kt

@@ -214,7 +214,7 @@ private fun Picture(
         onValueChange = { bookmarkGroupInfoViewModel.picture.value = it },
         placeholder = {
             Text(
-                text = "http://mygroup.com/logo.jpg",
+                text = "https://mygroup.com/logo.jpg",
                 color = MaterialTheme.colorScheme.placeholderText,
             )
         },

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/publicChannels/nip28PublicChat/metadata/ChannelMetadataScreen.kt

@@ -285,7 +285,7 @@ private fun Picture(
         onValueChange = { postViewModel.channelPicture.value = it },
         placeholder = {
             Text(
-                text = "http://mygroup.com/logo.jpg",
+                text = "https://mygroup.com/logo.jpg",
                 color = MaterialTheme.colorScheme.placeholderText,
             )
         },

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/lists/list/PeopleListItem.kt

@@ -87,7 +87,7 @@ import com.vitorpamplona.amethyst.ui.theme.ThemeComparisonColumn
 
 private const val PREVIEW_LIST_TITLE = "Sample List Title"
 private const val PREVIEW_LIST_DESCRIPTION = "Sample List Description"
-private const val PREVIEW_LIST_IMAGE = "http://some.com/image.png"
+private const val PREVIEW_LIST_IMAGE = "https://some.com/image.png"
 
 @Preview()
 @Composable

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/lists/list/metadata/FollowPackMetadataScreen.kt

@@ -238,7 +238,7 @@ private fun Picture(
         onValueChange = { postViewModel.picture.value = it },
         placeholder = {
             Text(
-                text = "http://mygroup.com/logo.jpg",
+                text = "https://mygroup.com/logo.jpg",
                 color = MaterialTheme.colorScheme.placeholderText,
             )
         },

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/lists/list/metadata/PeopleListMetadataScreen.kt

@@ -238,7 +238,7 @@ private fun Picture(
         onValueChange = { postViewModel.picture.value = it },
         placeholder = {
             Text(
-                text = "http://mygroup.com/logo.jpg",
+                text = "https://mygroup.com/logo.jpg",
                 color = MaterialTheme.colorScheme.placeholderText,
             )
         },

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/qrcode/ShowQRScreen.kt

@@ -85,8 +85,8 @@ fun ShowQRScreenPreview() {
                 name = "My Name"
                 picture = "Picture"
                 nip05 = null
-                banner = "http://banner.com/test"
-                website = "http://mywebsite.com/test"
+                banner = "https://banner.com/test"
+                website = "https://mywebsite.com/test"
                 about = "This is the about me"
             },
             MetadataEvent(

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/relays/RelayInformationScreen.kt

@@ -1677,8 +1677,8 @@ fun RelayHeaderPreview() {
                     ),
                     SpamDebugMessage(
                         time = TimeUtils.now() - 24000,
-                        link1 = "http://test1.com",
-                        link2 = "http://test2.com",
+                        link1 = "https://test1.com",
+                        link2 = "https://test2.com",
                     ),
                 ),
             accountViewModel = mockAccountViewModel(),