[generic] Unescape HTML escape sequences in redirect urls (fixes #6311)

youtube_dl/extractor/generic.py

@@ -1702,7 +1702,7 @@ class GenericIE(InfoExtractor):
                 if refresh_header:
                     found = re.search(REDIRECT_REGEX, refresh_header)
             if found:
-                new_url = compat_urlparse.urljoin(url, found.group(1))
+                new_url = compat_urlparse.urljoin(url, unescapeHTML(found.group(1)))
                 self.report_following_redirect(new_url)
                 return {
                     '_type': 'url',