Add ability to delete artwork from database

jellyfin_kodi/objects/kodi/artwork.py

@@ -84,3 +84,9 @@ class Artwork(object):
 
             elif artwork.get(art):
                 self.update(*(artwork[art],) + args + (KODI[art],))
+
+    def delete(self, *args):
+
+        ''' Delete artwork from kodi database
+        '''
+        self.cursor.execute(QU.delete_art, args)

jellyfin_kodi/objects/kodi/queries.py

@@ -551,6 +551,11 @@ delete_episode = """
 DELETE FROM     episode
 WHERE           idEpisode = ?
 """
+delete_art = """
+DELETE FROM     art
+WHERE           media_id = ?
+AND             media_type = ?
+"""
 delete_backdrops = """
 DELETE FROM     art
 WHERE           media_id = ?