Replace suffixes for @PreviewsDayNight annotation (#1736)

* Replace suffix for PreviewsDayNight annotation

* Rename Preview, since its filename was way too long

* Update screenshots

---------

Co-authored-by: ElementBot <benoitm+elementbot@element.io>

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/components/virtual/TimelineEncryptedHistoryBannerView.kt

@@ -79,7 +79,7 @@ private fun SessionState.toStringResId(): Int {
 
 @PreviewsDayNight
 @Composable
-internal fun TimelineEncryptedHistoryBannerViewPreview(
+internal fun EncryptedHistoryBannerViewPreview(
     @PreviewParameter(SessionStateProvider::class) sessionState: SessionState,
 ) = ElementPreview {
     TimelineEncryptedHistoryBannerView(sessionState = sessionState)

libraries/designsystem/src/main/kotlin/io/element/android/libraries/designsystem/preview/PreviewsDayNight.kt

@@ -26,7 +26,7 @@ import androidx.compose.ui.tooling.preview.Preview
  *
  * NB: Length of this constant is kept to a minimum to avoid screenshot file names being too long.
  */
-const val NIGHT_MODE_NAME = "N"
+const val NIGHT_MODE_NAME = "Night"
 
 /**
  * Marker for a day mode preview.
@@ -35,7 +35,7 @@ const val NIGHT_MODE_NAME = "N"
  *
  * NB: Length of this constant is kept to a minimum to avoid screenshot file names being too long.
  */
-const val DAY_MODE_NAME = "D"
+const val DAY_MODE_NAME = "Day"
 
 /**
  * Generates 2 previews of the composable it is applied to: day and night mode.