fix: App crashes on restart in android

Author: vakrilov

Diff for: nativescript-angular/platform-common.ts

@@ -153,7 +153,6 @@ export class NativeScriptPlatformRef extends PlatformRef {
             "nativescript-angular/platform-common.launchCallback",
             (args: LaunchEventData) => {
                 bootstrapLog("Application launch event fired");
-                off(launchEvent, launchCallback);
 
                 let bootstrapPromiseCompleted = false;
                 this._bootstrapper().then(