Fix queue deletion potentially removing wrong episode (#8586)

### Description

Fix queue deletion potentially removing wrong episode.
FeedItemEvent.indexOfItemWithId returns -1 when an item isn't found in
the list; queue.remove(-1) in Java removes the last element. A
removed/missing item therefore silently removes the last episode in the
queue. This is only a visual glitch, not something related to the
database, but still worth guarding against.

### Checklist
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app/src/main/java/de/danoeh/antennapod/ui/screen/queue/QueueFragment.java

@@ -156,8 +156,10 @@ public class QueueFragment extends Fragment implements MaterialToolbar.OnMenuIte
             case REMOVED:
             case IRREVERSIBLE_REMOVED:
                 position = FeedItemEvent.indexOfItemWithId(queue, event.item.getId());
-                queue.remove(position);
-                recyclerAdapter.notifyItemRemoved(position);
+                if (position >= 0) {
+                    queue.remove(position);
+                    recyclerAdapter.notifyItemRemoved(position);
+                }
                 break;
             case CLEARED:
                 queue.clear();
@@ -165,8 +167,10 @@ public class QueueFragment extends Fragment implements MaterialToolbar.OnMenuIte
                 break;
             case MOVED:
                 position = FeedItemEvent.indexOfItemWithId(queue, event.item.getId());
-                queue.add(event.position, queue.remove(position));
-                recyclerAdapter.notifyItemMoved(position, event.position);
+                if (position >= 0) {
+                    queue.add(event.position, queue.remove(position));
+                    recyclerAdapter.notifyItemMoved(position, event.position);
+                }
                 break;
             default:
                 return;