backends/drm: disable degamma_lut and ctm on NVidia

The NVidia driver maps them to hardware planes, which means they do not
apply to the cursor because the cursor plane doesn't have these color
operations.

BUG: 491634

src/backends/drm/drm_crtc.cpp

@@ -55,11 +55,11 @@ bool DrmCrtc::updateProperties()
             m_postBlendingColorOps.push_back(std::make_unique<LegacyLutColorOp>(next, &gammaLut, gammaLutSize.value()));
             next = m_postBlendingColorOps.back().get();
         }
-        if (ctm.isValid()) {
+        if (!gpu()->isNVidia() && ctm.isValid()) {
             m_postBlendingColorOps.push_back(std::make_unique<LegacyMatrixColorOp>(next, &ctm));
             next = m_postBlendingColorOps.back().get();
         }
-        if (degammaLut.isValid() && degammaLutSize.isValid() && degammaLutSize.value() > 0) {
+        if (!gpu()->isNVidia() && degammaLut.isValid() && degammaLutSize.isValid() && degammaLutSize.value() > 0) {
             m_postBlendingColorOps.push_back(std::make_unique<LegacyLutColorOp>(next, &degammaLut, degammaLutSize.value()));
             next = m_postBlendingColorOps.back().get();
         }