backend/drm: rollback atomic blobs
If the atomic commit fails or is test-only, rollback wlr_drm_crtc.{mode_id,gamma_lut} blob IDs to their previous value. This prevents the next commits from failing or applying test-only state.
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If the atomic commit fails or is test-only, rollback wlr_drm_crtc.{mode_id,gamma_lut} blob IDs to their previous value. This prevents the next commits from failing or applying test-only state.