when app is closed and make a change, it doesn't open

Environment
Provide version numbers for the following components (information can be retrieved by running tns info in your project folder or by inspecting the package.json of the project):

• CLI: rc(5.2.0-2019-02-07-12917)
• iOS Runtime:5.1.1

Describe the bug
App is successfully synced but it not loaded

To Reproduce

1. tns create appNG --ng
2. tns run ios --hmr
3. make a change in css file. The change will apply correctly.
4. close the app from device as press home button.
5. make a change again in css file you will see that the app doesn't open but console logs are:
   Refreshing application on device f42eb590ec7ad920c8c0545a308e1a1d2551218b... Successfully synced application org.nativescript.appNG on device f42eb590ec7ad920c8c0545a308e1a1d2551218b.

Expected behavior
the app must open and work correct

先執行 tns info，然後使用 tns create appNG --ng 和 tns run ios --hmr 重現問題。應用程式開啟時修改一個 CSS 檔案，關閉應用程式後，再次修改 CSS。完成的標準是第二次修改後 iOS 應用程式能夠開啟並正常運作，而不只是回報同步成功。