Game window renders transparent when launched with -game -log commands on Mac

This is only occurring on Mac and only in OSX 10.12.

This is also a regression from 4.13

Right clicking in the dock, Show all windows, and selecting the game window does NOT fix the issue.

Running in -fullscreen does fix the issue

Standalone Game from within the editor DOES NOT have this issue.

This also affects packaged games on Mac

1. Launch QAGame through the terminal using

   open UE4Editor.app --args QAGame.uproject -game -log

Result: Game window renders transparently

Fix UE-51650

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