[BUG] Mouse4 (previous page hotkey) leads to a black screen if pressed after closing the Edit Game menu

[VCheesey]

Describe the bug
Mouse4 (the "return to previous page" hotkey) leads to a black screen if pressed right after closing the Edit Game menu.

To Reproduce
Steps to reproduce the behavior:

1. Select a game in the FP launcher
2. Click the Edit Game button
3. Exit the Edit Game menu (make a change and save it or discard changes, either works)
4. Press Mouse4 (assuming it's hotkeyed to take you to the previous page)
5. You're now stuck on a black screen and have to reopen Flashpoint to get rid of it.

Expected behavior
Mouse4 either returns you to the Edit Game menu of the game you just edited, or ignores that page and takes you to the last page before it that isn't an Edit Game menu.

Desktop (please complete the following information):

• OS: Windows 10
• Flashpoint Version: 14.0.3