Eleven: Fix adding a song to a playlist

* Currently the menu shows "New playlist" on top in addition to the
  positive button having the same action
* The menu item for "new playlist" is treated as if it were a playlist
  resulting in a crash due to it not being a playlist
* Remove the menu item since it's handled by the "ok" button just fine

* Test:
  - Add song to playlist
  - Only button allows adding to a new playlist

* Fixes a part of
  https://gitlab.com/LineageOS/issues/android/-/issues/3531

Change-Id: Ice781c07c812602976360fb6bf9136582b0ac592