http: Remove default arguments from prepare callback function.

rhodecode/lib/hooks_daemon.py

@@ -195,9 +195,8 b' class HttpHooksCallbackDaemon(ThreadedHo'
         self._callback_thread = None
 
 
-def prepare_callback_daemon(extras, protocol=None, use_direct_calls=False):
+def prepare_callback_daemon(extras, protocol, use_direct_calls):
     callback_daemon = None
-    protocol = protocol.lower() if protocol else None
 
     if use_direct_calls:
         callback_daemon = DummyHooksCallbackDaemon()