OpenXR: Fix enabling passthrough via environment blend mode in project settings #94550
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PR #87630 made it possible to enable passthrough by setting the environment blend mode to "alpha blend", even on headsets that need to use a special passthrough extension - in that case it works by emulating alpha blend mode.
Currently, this is working great if you set the environment blend mode via code!
However, it you set it in project settings, you'll get this error:
This is because we're checking the blend mode before OpenXR extension wrappers have had the opportunity to enable emulation of alpha blend mode.
This PR basically moves these checks to later, after
on_session_created()
is run on all the extension wrappers.