Fix youtube addon call for trailer playback

youtube addon maintainer says RunPlugin is an invalid way to call the addon.

So changed the call to use PlayMedia

More info on anxdpanic/plugin.video.youtube#937

resources/lib/functions.py

@@ -945,7 +945,10 @@ def play_action(params):
 
 def play_item_trailer(item_id):
     log.debug("== ENTER: playTrailer ==")
-
+    handle = int(sys.argv[1]) if sys.argv and len(sys.argv) > 1 else None
+    if handle:
+        xbmcplugin.endOfDirectory(int(sys.argv[1]), succeeded=False, updateListing=False, cacheToDisc=False)
+
     url = "/Users/{}/Items/{}/LocalTrailers?format=json".format(
         user_details.get('user_id'), item_id
     )
@@ -1021,7 +1024,7 @@ def play_item_trailer(item_id):
         elif trailer.get("type") == "remote":
             youtube_id = trailer.get("url").rsplit('=', 1)[1]
             url_root = "plugin.video.youtube/play/?video_id="
-            play_url = "RunPlugin(plugin://{}{})".format(url_root, youtube_id)
+            play_url = "PlayMedia(plugin://{}{})".format(url_root, youtube_id)
             log.debug("youtube_plugin: {0}".format(play_url))
 
             xbmc.executebuiltin(play_url)