[BUG]Core-GUI stop running session popup bug

[sei-gseroka]

Describe the bug
Closing a core-gui window with a running session results in a "Stop the running session" popup. Clicking on cancel still closes the window.

To Reproduce
Steps to reproduce the behavior:

1. Open core-gui
2. Start a session
3. Close the window
4. Click Cancel on the popup
5. The core-gui window still closes

Expected behavior
Clicking cancel should result in no change except the stop the running session popup being dismissed.

Desktop (please complete the following information):

• OS: [e.g. Ubuntu 18.04]
• CORE Version [e.g. 5.2.1]
• EMANE Version [e.g. 1.2.4]

[bharnden]

Will look into correcting this, thanks.

[bharnden]

fixed on develop, thank you for pointing this out