'GetDefault()' functions in GameUserSettings should be Virtual

Related Issue Here: Packaged Games in 4.14 Start in 'Windowed' Mode - Platform & Builds - Unreal Engine Forums

In 4.13 / 4.14, the Default Window mode function was changed so that games start in ‘Windowed’ Mode. This is undesirable for our game, but we have an in-game options menu and don’t want to force borderless with command line.

The correct way to change this would be to change the default mode in our custom GameUserSettings class, but most of the ‘GetDefault’ functions are not virtual. Can these please be made virtual so that custom project settings classes can change the default properties?