playback: handle deferred action on startup

Dropped this when I ripped out the code prior.

app/src/main/java/org/oxycblt/auxio/playback/state/PlaybackStateManager.kt

@@ -416,6 +416,7 @@ class PlaybackStateManagerImpl @Inject constructor() : PlaybackStateManager {
             stateHolder.applySavedState(stateMirror.parent, stateMirror.rawQueue, null)
             stateHolder.seekTo(stateMirror.progression.calculateElapsedPositionMs())
             stateHolder.playing(false)
+            pendingDeferredPlayback?.let(stateHolder::handleDeferred)
         }
     }