httprepo: always store the response url (issue1968)

Fixes a regression caused by 54b518fc6671

mercurial/httprepo.py

@@ -95,7 +95,7 b' class httprepository(repo.repository):'
             resp_url = resp_url[:-len(qs)]
         if self._url.rstrip('/') != resp_url.rstrip('/'):
             self.ui.status(_('real URL is %s\n') % resp_url)
-            self._url = resp_url
+        self._url = resp_url
         try:
             proto = resp.getheader('content-type')
         except AttributeError: