Added Comcast_SSO fix

This fix had been proposed on yt-dl for a lengthy period of time but was never merged. It has been thoroughly tested but a large section of the community.

youtube_dlc/extractor/adobepass.py

@@ -1438,6 +1438,13 @@ class AdobePassIE(InfoExtractor):
                             provider_redirect_page, 'oauth redirect')
                         self._download_webpage(
                             oauth_redirect_url, video_id, 'Confirming auto login')
+                    elif 'automatically signed in with' in provider_redirect_page:
+                        # Seems like comcast is rolling up new way of automatically signing customers
+                        oauth_redirect_url = self._html_search_regex(
+                            r'continue:\s*"(https://oauth.xfinity.com/oauth/authorize\?.+)"', provider_redirect_page,
+                            'oauth redirect (signed)')
+                        # Just need to process the request. No useful data comes back
+                        self._download_webpage(oauth_redirect_url, video_id, 'Confirming auto login')
                     else:
                         if '<form name="signin"' in provider_redirect_page:
                             provider_login_page_res = provider_redirect_page_res