[twitter] Don't check /cards/ URLs

Fixes #9181

In this tweet, there are two cards:
1. https://twitter.com/i/cards/tfw/v1/719944006306701313
   This shows #TeamCap vs. #TeamIronMan
2. https://twitter.com/i/videos/tweet/719944021058060289
   This is the real video and can be handled by TwitterCardIE

In all current test_Twitter* tests, /videos/tweet/ approach works fine.

youtube_dl/extractor/twitter.py

@@ -260,6 +260,17 @@ class TwitterIE(InfoExtractor):
             'upload_date': '20140615',
         },
         'add_ie': ['Vine'],
+    }, {
+        'url': 'https://twitter.com/captainamerica/status/719944021058060289',
+        # md5 constantly changes
+        'info_dict': {
+            'id': '719944021058060289',
+            'ext': 'mp4',
+            'title': 'Captain America - @King0fNerd Are you sure you made the right choice? Find out in theaters.',
+            'description': 'Captain America on Twitter: "@King0fNerd Are you sure you made the right choice? Find out in theaters. https://t.co/GpgYi9xMJI"',
+            'uploader_id': 'captainamerica',
+            'uploader': 'Captain America',
+        },
     }]
 
     def _real_extract(self, url):
@@ -284,17 +295,6 @@ def _real_extract(self, url):
             'title': username + ' - ' + title,
         }
 
-        card_id = self._search_regex(
-            r'["\']/i/cards/tfw/v1/(\d+)', webpage, 'twitter card url', default=None)
-        if card_id:
-            card_url = 'https://twitter.com/i/cards/tfw/v1/' + card_id
-            info.update({
-                '_type': 'url_transparent',
-                'ie_key': 'TwitterCard',
-                'url': card_url,
-            })
-            return info
-
         mobj = re.search(r'''(?x)
             <video[^>]+class="animated-gif"(?P<more_info>[^>]+)>\s*
                 <source[^>]+video-src="(?P<url>[^"]+)"