GGG: Fix Windowed Fullscreen

You introduced a bug this patch where clients are defaulting to Fullscreen, and when you go into settings and attempt to change back to Windowed Fullscreen, the client either crashes, or freezes until the automatic revert.

The only workaround I've found is to switch temporarily to Vulkan, change to Windowed Fullscreen, then back to DirectX 12.

Changing these settings in previous leagues was near-instant and did not result in a freeze or crash.