OpenXR - Hotfix for v69

[lvonasek]

This is a fix for #19399.

There are two things what changed:

1. The system started complaining about the reference pose when I create new XrSpace (coordinate system). It had definetely right to do that as the numbers where unlogical.
2. Something changed with the depth buffer. I tried several things but only one thing which worked is to remove depth buffer from XR FBO (which shouldn't be a problem as the emulator uses own FBOs and copy into the XR FBO in the end, right?)

[lvonasek]

DUring testing I figured out that Sonic Rivals is broken in immersive mode. I addresed that issue. The PR is ready to go.

[hrydgard]

OK, let't get it in.