[httpupload] Add url oob tag also in groupchat

httpupload/httpupload.py

@@ -63,6 +63,8 @@ class HttpuploadPlugin(GajimPlugin):
                 ged.PRECORE, self.handle_agent_info_received),
             'stanza-message-outgoing': (
                 ged.PRECORE, self.handle_outgoing_stanza),
+            'gc-stanza-message-outgoing': (
+                ged.PRECORE, self.handle_outgoing_stanza),
             'raw-iq-received': (
                 ged.PRECORE, self.handle_iq_received)}
         self.gui_extension_points = {