update external ids

MediaBrowser.Providers/Music/MusicExternalIds.cs

@@ -1,5 +1,4 @@
 using MediaBrowser.Controller.Entities;
-using MediaBrowser.Controller.Entities.Audio;
 using MediaBrowser.Controller.Providers;
 using MediaBrowser.Model.Entities;
 

MediaBrowser.Providers/Plugins/MusicBrainz/MusicBrainzExternalIds.cs → MediaBrowser.Providers/Plugins/MusicBrainz/ExternalIds.cs

@@ -1,4 +1,3 @@
-using MediaBrowser.Controller.Entities;
 using MediaBrowser.Controller.Entities.Audio;
 using MediaBrowser.Controller.Providers;
 using MediaBrowser.Model.Entities;