Fix CRT shader: add missing QSV decoder path in VAAPI+QSV pipeline
The SDR case (QSV decoder + QSV encoder, no OCL tonemap) was never handled — the frame stayed in QSV VRAM with no OpenCL round-trip, so the CRT filter was simply never applied. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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