[rottentomatoes] Modernize test definition

youtube_dl/extractor/rottentomatoes.py

@@ -10,8 +10,9 @@ class RottenTomatoesIE(VideoDetectiveIE):
 
     _TEST = {
         'url': 'http://www.rottentomatoes.com/m/toy_story_3/trailers/11028566/',
-        'file': '613340.mp4',
         'info_dict': {
+            'id': '613340',
+            'ext': 'mp4',
             'title': 'TOY STORY 3',
             'description': 'From the creators of the beloved TOY STORY films, comes a story that will reunite the gang in a whole new way.',
         },