[tf1] Fix a regular expression (closes #9656)

This is a Python bug fixed in 2.7.6 [1]

[1] https://github.com/rg3/youtube-dl/issues/9656#issuecomment-222968594

youtube_dl/extractor/tf1.py

@@ -48,6 +48,6 @@ class TF1IE(InfoExtractor):
         video_id = self._match_id(url)
         webpage = self._download_webpage(url, video_id)
         wat_id = self._html_search_regex(
-            r'(["\'])(?:https?:)?//www\.wat\.tv/embedframe/.*?(?P<id>\d{8})(?:.*?)?\1',
+            r'(["\'])(?:https?:)?//www\.wat\.tv/embedframe/.*?(?P<id>\d{8}).*?\1',
             webpage, 'wat id', group='id')
         return self.url_result('wat:%s' % wat_id, 'Wat')