[francetv] fix style issues reported by flake8

* Don't redefine variable in list comprehension
* Line missing indentation

youtube_dl/extractor/francetv.py

@@ -85,9 +85,9 @@ class FranceTVBaseInfoExtractor(InfoExtractor):
 
         subtitles = {}
         subtitles_list = [{
-            'url': subtitle['url'],
+            'url': subformat['url'],
-            'ext': subtitle.get('format'),
+            'ext': subformat.get('format'),
-        } for subtitle in info.get('subtitles', []) if subtitle.get('url')]
+        } for subformat in info.get('subtitles', []) if subformat.get('url')]
         if subtitles_list:
             subtitles['fr'] = subtitles_list