Drop some assumptions on how PlayerService is started and reused

Read the comments in the lines changed to understand more

app/src/main/java/org/schabi/newpipe/util/NavigationHelper.java

@@ -96,6 +96,7 @@ public final class NavigationHelper {
         }
         intent.putExtra(Player.PLAYER_TYPE, PlayerType.MAIN.valueForIntent());
         intent.putExtra(Player.RESUME_PLAYBACK, resumePlayback);
+        intent.putExtra(PlayerService.SHOULD_START_FOREGROUND_EXTRA, true);
 
         return intent;
     }