LibGUI: Ignore failing smo maps in resize event

This can be caused by sending two back-to-back resize requests. When
handling the first, the server may have already replaced the smo key
with a new one.

userspace/libraries/LibGUI/include/LibGUI/Window.h

@@ -96,7 +96,7 @@ namespace LibGUI
 		void on_socket_error(BAN::StringView function);
 		void cleanup();
 
-		BAN::ErrorOr<void> handle_resize_event(const EventPacket::ResizeWindowEvent&);
+		BAN::ErrorOr<bool> handle_resize_event(const EventPacket::ResizeWindowEvent&);
 
 		template<typename T>
 		void send_packet(const T& packet, BAN::StringView function);