music-manager.rb: do not move prefpane (#21659)

* music-manager.rb: do not move prefpane

* remove prefpane on uninstall

Author: vitorgalvao

Casks/music-manager.rb

@@ -10,5 +10,6 @@
   # Renamed for consistency: app name is different in the Finder and in a shell.
   # Original discussion: https://github.com/caskroom/homebrew-cask/pull/4282
   app 'MusicManager.app', target: 'Music Manager.app'
-  prefpane 'MusicManager.app/Contents/Helpers/MusicManager.prefPane'
+
+  uninstall delete: '~/Library/Preference Panes/MusicManager.prefPane'
 end