cad/PrusaSlicer: 3D view not rendered

Apply a hack to fix this issue until this is sorted out upstream.

Bump PORTREVISION

See https://github.com/prusa3d/PrusaSlicer/issues/6396

PR:	255690
Reported by:	a.parseg@gmail.com
Tested by:	a.parseg@gmail.com, mr@, teodorsigaev@gmail.com