Ctrl + z still active in PIE

Users can select ctrl + z while playing in Editor causing PIE to stop and undo last change, often freezing the editor temporarily, and sometimes causing a crash.

Workaround: This does not occur if user saves project before PIE

1. In UE 4.11 Preview, open blank third person project
2. delete random object (ie cube)
3. PIE in New Editor Window
4. Ctrl + Z
RESULT: PIE ends abruptly and previously deleted object is un-deleted
EXPECTED: PIE to not be affected by ctrl + z

Fix UE-51650

i have this problem UE4CC-Windows-58DC12AF4B97F057BD108FBFF569B2E9_0000

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