[Gear VR] back button behavior

[motorsep]

Interesting, when I was building my project with fully functional UM BP, I got the following warnings:

Cmd: OVRQUITMENU
Command not recognized: OVRQUITMENU
Cmd: OVRGLOBALMENU
Command not recognized: OVRGLOBALMENU

Even with that it worked! Thanks folks, I couldn’t have done it without your help!