Fix missing artist in play notification.

Author: valrus

src/actions/play.py

@@ -17,7 +17,7 @@ def main():
         artist = os.environ.get('ALFRED_MPD_ARTIST')
         if artist:
             query_args += ['albumartist', artist]
-            variables['albumartist'] = artist
+            variables['artist'] = artist
 
         track = os.environ.get('ALFRED_MPD_TRACK')
         if track:

src/filters/query.py

@@ -47,7 +47,7 @@ def main():
 
         artist = os.environ.get('ALFRED_MPD_ARTIST')
         if artist:
-            query_args += ['artist', artist]
+            query_args += ['albumartist', artist]
 
         print(json.dumps({
             'items': [