armode=true camera permissions loading error

[EdwardLu2018]

Describe the bug
Due to 048189a, jitsi now loads after armode=1 asks for camera permissions, and gives a black screen in webar/spotar mode with ?armode=1.

To Reproduce
Steps to reproduce the behavior:

1. Go to any scene with ?armode=1
2. It will ask for camera permissions for webar, then camera permissions for jitsi, then the screen will be black. This is because the passthrough video feed gets overriden by jitsi.

Expected behavior
Should maybe ask for jitsi camera permissions first, then webar?

[mwfarb]

I'll take a look at this tonight.

[mwfarb]

I just put this logic back the way it was for now.