Game config selection dialog doesn't use selected Qt style

[vrad-exe]

Describe the bug

When -style is passed to set a custom Qt style (such as -style fusion for a dark mode), this does not affect the game configurations dialog, even though it's now using Qt. Likely caused by the style not being set early enough internally.

To Reproduce

1. Ensure you have multiple game configurations
2. Run bin/win64/hammer.exe -style fusion
3. The style is not used for the game config selection dialog, but is used for all later Qt dialogs

Issue Map

N/A

Expected Behavior

The style should be used for all Qt UI

Operating System

Tested on Windows 10