Restart/shutdown when settings are applied

Summary: Shutdown flipper server whenever a restart is required.

Reviewed By: antonk52

Differential Revision: D49369884

fbshipit-source-id: 62d8aa9dd58408dc351617bb09df4509a819ab2f

desktop/flipper-ui-browser/src/initializeRenderHost.tsx

@@ -169,9 +169,7 @@ export function initializeRenderHost(
       );
     },
     restartFlipper() {
-      window.flipperShowMessage?.(
-        'Flipper settings have changed, please quit and wait for 30 seconds before re-launching for the changes to take effect',
-      );
+      flipperServer.exec('shutdown');
     },
     serverConfig: flipperServerConfig,
     GK(gatekeeper) {