Engine Scalability Resolution Scale does nothing until r.ScreenPercentage.Editor is set

The Resolution Scale Slider in the Engine Scalability Settings does not adjust any settings unless your first adjust the r.ScreenPercentage.Editor variable.

Also reproduced in Main - Promotable - CL - 2614839

1. Open QAGame Editor
2. Under Settings >> Engine Scalability, set the Resolution Scale to 25
3. Enter the Console Command, r.ScreenPercentage.Editor 10
4. # Under Settings >> Engine Scalability, set the Resolution Scale to 100

RESULTS: Screen Resolution changes after console variable is entered and again afterward by the Slider

EXPECTED: Should not have to enter an additional variable to use slider.

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