Do not close NowPlayingBottomSheet between tracks.

If the user opens the NowPlayingBottomSheet whilst playing a non empty
queue, leave the BottomSheet open at the end of the playing track.

Part-of: <https://dev.funkwhale.audio/funkwhale/funkwhale-android/-/merge_requests/343>

app/src/main/java/audio/funkwhale/ffa/views/NowPlayingBottomSheet.kt

@@ -74,7 +74,9 @@ class NowPlayingBottomSheet @JvmOverloads constructor(
 
   override fun show() {
     behavior.isHideable = false
-    close()
+    if (behavior.state == BottomSheetBehavior.STATE_HIDDEN) {
+      close()
+    }
   }
 
   override fun hide() {