Assume DUALSOURCE replace alpha means supported.

We already check supports when generating this value, don't need to check
again when using it.

GPU/Common/GPUStateUtils.cpp

@@ -181,7 +181,7 @@ ReplaceAlphaType ReplaceAlphaWithStencil(ReplaceBlendType replaceBlend) {
 		if (nonAlphaSrcFactors[gstate.getBlendFuncA()] && nonAlphaDestFactors[gstate.getBlendFuncB()]) {
 			return REPLACE_ALPHA_YES;
 		} else {
-			if (gstate_c.featureFlags & GPU_SUPPORTS_DUALSOURCE_BLEND) {
+			if (gstate_c.Supports(GPU_SUPPORTS_DUALSOURCE_BLEND)) {
 				return REPLACE_ALPHA_DUALSOURCE;
 			} else {
 				return REPLACE_ALPHA_NO;
@@ -1039,7 +1039,7 @@ void ConvertBlendState(GenericBlendState &blendState, bool allowShaderBlend) {
 		}
 	}
 
-	if (replaceAlphaWithStencil == REPLACE_ALPHA_DUALSOURCE && gstate_c.Supports(GPU_SUPPORTS_DUALSOURCE_BLEND)) {
+	if (replaceAlphaWithStencil == REPLACE_ALPHA_DUALSOURCE) {
 		glBlendFuncA = toDualSource(glBlendFuncA);
 		glBlendFuncB = toDualSource(glBlendFuncB);
 	}