Fix multiple typescript/sass watchers

Whenever using CLI as a library, calling livesync multiple times leads to multiple typescript/sass watchers.
This happens due to the fact that `currentWatcherInfo.pattern` is an array and checking two arrays for equality with `!==` is bound to return `true` at all times. `toString()` both arrays and check the string literals instead.

Author: Mitko-Kerezov

lib/definitions/livesync.d.ts

@@ -60,7 +60,7 @@ interface ILiveSyncProcessInfo {
 	timer: NodeJS.Timer;
 	watcherInfo: {
 		watcher: IFSWatcher,
-		pattern: string | string[]
+		pattern: string[]
 	};
 	actionsChain: Promise<any>;
 	isStopped: boolean;

lib/services/livesync/livesync-service.ts

@@ -526,8 +526,7 @@ export class LiveSyncService extends EventEmitter implements IDebugLiveSyncServi
 		}
 
 		const currentWatcherInfo = this.liveSyncProcessesInfo[liveSyncData.projectDir].watcherInfo;
-
-		if (!currentWatcherInfo || currentWatcherInfo.pattern !== pattern) {
+		if (!currentWatcherInfo || _.difference(currentWatcherInfo.pattern, pattern).length || _.difference(pattern, currentWatcherInfo.pattern).length) {
 			if (currentWatcherInfo) {
 				currentWatcherInfo.watcher.close();
 			}