Revert "refactor play count update to be cleaner, code-wise"

This reverts commit cd52a893d4, which introduced a regression.
Pages with a tracklist may not have the same in-memory model of the track,
so it is necessary to directly inform them of play count updates.

ui/browsing/albumpage.go

@@ -100,15 +100,14 @@ func (a *AlbumPage) Route() Route {
 	return AlbumRoute(a.albumID)
 }
 
-var _ CanShowNowPlaying = (*AlbumPage)(nil)
-
-func (a *AlbumPage) OnSongChange(song *subsonic.Child) {
+func (a *AlbumPage) OnSongChange(song *subsonic.Child, lastScrobbledIfAny *subsonic.Child) {
 	if song == nil {
 		a.nowPlayingID = ""
 	} else {
 		a.nowPlayingID = song.ID
 	}
 	a.tracklist.SetNowPlaying(a.nowPlayingID)
+	a.tracklist.IncrementPlayCount(lastScrobbledIfAny)
 }
 
 func (a *AlbumPage) Reload() {