Fix byte packing (and buffer overrun) in godot_webxr_get_bounds_geometry() #73068
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While working on PR #72938, I noticed this bug in
godot_webxr_get_bounds_geometry().It's incorrectly byte packing the data to pass it from Javascript to C++, and will actually overrun the buffer by 4 bytes!
Unlike the referenced issue, this one would be good to get in for 4.0.