[Gear VR] back button behavior

[motorsep]

@moulder6;502664

Something to add, just in case.

Setting gearvr.HandleBackButton to 0 turns off the automatic 4.11 handling of the GearVR back button and makes possible the execution of the blueprint solution that’s described in the Unreal Help (including drawing the progress bar, etc.). However the example in the docs only handles long press, so u’ll have to extend that blueprint if u want it to react properly on short press

Well, like I noted in the bug report, with that cvar set to 0, back button doesn’t work at all. So either it’s another bug, or Epic’s documentation yet again out of date