playback: fix playback progress bug

Fix an issue where I forgot to call executePendingBindings when
updating progress, resulting in strange behavior with the progress
bar.

app/src/main/java/org/oxycblt/auxio/MainFragment.kt

@@ -66,7 +66,6 @@ class MainFragment : Fragment(), PlaybackBarLayout.ActionCallback {
         binding.lifecycleOwner = viewLifecycleOwner
 
         // --- VIEWMODEL SETUP ---
-
         binding.mainBarLayout.setActionCallback(this)
 
         binding.mainBarLayout.setSong(playbackModel.song.value)

app/src/main/java/org/oxycblt/auxio/playback/CompactPlaybackView.kt

@@ -84,6 +84,7 @@ class CompactPlaybackView @JvmOverloads constructor(
 
     fun setSong(song: Song) {
         binding.song = song
+        binding.executePendingBindings()
     }
 
     fun setPlaying(isPlaying: Boolean) {
@@ -91,11 +92,6 @@ class CompactPlaybackView @JvmOverloads constructor(
     }
 
     fun setPosition(position: Long) {
-        if (binding.song == null) {
-            binding.playbackProgressBar.progress = 0
-            return
-        }
-
         binding.playbackProgressBar.progress = position.toInt()
     }