Setting an overlay's alpha to 0 does not display as fully transparent

Safe zone overlay ignores alpha when set to 0.0 in DefaultEngine.ini.

Tested:  4.23.1 CL#9631420 , 4.25 CL#11341939

1. In the projects DefaultEngine.ini, add the following: 
   [SystemSettings]
   r.DebugSafeZone.Mode=1
   r.DebugSafeZone.TitleRatio=0.7
   r.DebugSafeZone.ActionRatio=0.9
   r.DebugSafeZone.OverlayAlpha=0.0

      2. Launch as Standalone Game  

Result: The transparency of the overlay does not respond to the set alpha of 0

Expected: The overlay to be fully transparent as shown in the documentation

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