Ignore .DS_Store file changes on Mac (#2473)

* Ignore .DS_Store file changes on Mac

### chokidar#path-filtering
https://github.com/paulmillr/chokidar#path-filtering

Resolves:
#2472

* Updated to ignored: '**/*.DS_Store'

lib/services/livesync/livesync-service.ts

@@ -119,7 +119,7 @@ class LiveSyncService implements ILiveSyncService {
 	private partialSync(syncWorkingDirectory: string, onChangedActions: ((event: string, filePath: string, dispatcher: IFutureDispatcher) => Promise<void>)[]): void {
 		let that = this;
 		let pattern = ["app", "package.json", "node_modules"];
-		let watcher = choki.watch(pattern, { ignoreInitial: true, cwd: syncWorkingDirectory }).on("all", (event: string, filePath: string) => {
+		let watcher = choki.watch(pattern, { ignoreInitial: true, cwd: syncWorkingDirectory, ignored: '**/*.DS_Store' }).on("all", (event: string, filePath: string) => {
 			that.$dispatcher.dispatch(async () => {
 				try {
 					filePath = path.join(syncWorkingDirectory, filePath);