1.56.6 postprocess output black on windows

**Describe the bug**
filament 1.56.6
on windows platform, `view->setPostProcessingEnabled(false);` must be set because pp's output wrong stuff, usually black.

**To Reproduce**
Steps to reproduce the behavior:
1. cd out/
2. cmake ../..
3. run gltf_viewer and toggle pp on/off, then screen turns black.

**Expected behavior**
correct pp like macos. Or would you please point out how to solve this on current version, because i checked that main branch is fine.