GoogleVR apps prevent adjusting the volume for the phone while running

4.13.1 has caused an issue where the volume can no longer be adjusted for a GoogleVR application. This is a regression of functionality in 4.13.0.

Tested with build:
Working: 4.13.0 Binary CL-3106830
Broken: 4.13.1 Binary CL-3142249
Working: 4.14 Dev-VR CL-3146140

Phone version: Asset #6049 - Galaxy S6(SM-G920F), OS-5.1.1

Settings SDKConfig:
Using Android NDK r11c
SDK and NDK API Level set to android-21

1. Open UE4 (Or the attached test project)
2. Set any sound to play on level start via blueprint and have it loop
3. Setup the project for GoogleVR specifically
4. Deploy to device
5. On device: adjust the volume using the volume controls of the phone

Regression: Yes

Results: Volume cannot be adjusted while in GoogleVR mode for the app.

Expected: The volume should be adjustable.

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