Allow PlaybackType.SKILL search results to be played when there is …

…no GUI

As described in #92, this commit permits search results of `PlaybackType.SKILL`
to be played when there is no GUI. The skill handles playback itself and
may not need a GUI.

fixes #92

ovos_plugin_common_play/ocp/__init__.py

@@ -378,7 +378,7 @@ def _search(self, phrase, utterance, media_type):
             LOG.info("unable to use GUI, filtering non-audio results")
             # filter video only streams
             results = [r for r in results
-                       if r["playback"] == PlaybackType.AUDIO]
+                       if r["playback"] in [PlaybackType.AUDIO, PlaybackType.SKILL]]
         LOG.debug(f"Returning {len(results)} results")
         return results