Fix remove_specific_occurrences function
Fix remove_specific_occurrences function

user_playlist_remove_specific_occurrences_of_tracks is expecting a
different tracklist object to the one that is documented, causing a
"'dict' object has no attribute 'split'" error. Update it to expect the
correct format.

mayblue9/spotipy,mattdennewitz/spotipy,rlkelly/spotipy,code-kitchen/spotipy,plamere/spotipy,jimcortez/spotipy_twisted,joohoi/spotipy,mattiamaestrini/spotipy,jimcortez/spotipy_twisted