fix(player): clear queue when closing player

Fixes an issue, where the `currentStream` was not cleared when closing the
player. This could lead to an issue, where not all video options where
displayed, even if the video was no longer playing.

Ref: libre-tube@f262210

Author: FineFindus

app/src/main/java/com/github/libretube/services/AbstractPlayerService.kt

@@ -409,6 +409,8 @@ abstract class AbstractPlayerService : MediaLibraryService(), MediaLibrarySessio
                 mediaLibrarySession = null
             }
 
+            PlayingQueue.clear()
+
             ServiceCompat.stopForeground(this, ServiceCompat.STOP_FOREGROUND_REMOVE)
             stopSelf()
 

app/src/main/java/com/github/libretube/util/PlayingQueue.kt

@@ -37,6 +37,7 @@ object PlayingQueue {
         }
         queueJobs.clear()
         queue.clear()
+        currentStream = null
     }
 
     /**