[iOS][Debug] "tns debug ios --start" is not working if the app is previously started with "tns debug ios" #2456

CLI version: 2.5
iOS Runtime version: 2.5

Steps to reproduce:

1. Run tns debug ios in the app root. This should deploy the app and attach the WebInspector.
2. Close the WebInspector and close/kill the CLI process (Ctrl+C/Ctrl+\). The app should still be opened in the emulator.
3. Run tns debug ios --start.
   The expected result is the WebInspector to be started and attached to the already running app without restarting it. The actual behavior is stopping the app without even starting it again.

Note: if the app is previously started with clicking on the app icon, tns debug ios --start works as expected.