Steps to reproduce:

1. Open attached project.
2. Build a game for PC standalone platform and run it.
3. If the game is not running in full screen mode, press "FullScreen" button (top left corner).
4. Notice that full screen mode works correctly.
5. Press "FullScreen" button again to exit full screen mode.
6. Change the display resolution through control panel and apply changes.
7. Go back to the game and enter full screen mode.
8. Notice that the game is not running in full screen mode anymore.
9. Exit the game and run it again.
10. Notice that full screen mode works correctly.

Expected result:
Full screen mode should be updated and adjusted as soon as the display resolution changes, not when the player exits the game and runs it again.

Reproduced with:
5.1.0f3, 5.3.4f1, 5.4.0b15.