Remove unnecessary case

Author: MarcialRosales

deps/rabbitmq_auth_backend_oauth2/src/rabbit_auth_backend_oauth2.erl

@@ -121,10 +121,7 @@ update_state(AuthUser, NewToken) ->
                                                     impl = fun() -> DecodedToken end}};
                         {error, mismatch_username_after_token_refresh} -> 
                             {refused, 
-                                "Not allowed to change username on refreshed token"};
-                        {error, Error} ->
-                            {refused, 
-                                rabbit_misc:format("Failed to refresh token due to ~p", [Error])}
+                                "Not allowed to change username on refreshed token"}
                     end
             end
     end.