decorator: Remove unnecessary flag for process_client.

We can express the same idea more simply by not passing `user` in
cases where it isn't valid for UserActivity.

Signed-off-by: Zixuan James Li <p359101898@gmail.com>

zerver/views/auth.py

@@ -949,7 +949,7 @@ def check_server_incompatibility(request: HttpRequest) -> bool:
 @csrf_exempt
 def api_get_server_settings(request: HttpRequest) -> HttpResponse:
     # Log which client is making this request.
-    process_client(request, request.user, skip_update_user_activity=True)
+    process_client(request)
     result = dict(
         authentication_methods=get_auth_backends_data(request),
         zulip_version=ZULIP_VERSION,