change clamp to saturate in shader templates

per discussions

src/core/hle/D3D8/Direct3D9/CxbxPixelShaderTemplate.hlsl

@@ -398,7 +398,7 @@ PS_OUTPUT main(const PS_INPUT xIn)
 	// Note : VFACE/FrontFace has been unreliable, investigate again if some test-case shows bland colors
 	v0 = isFrontFace ? xIn.iD0 : xIn.iB0; // Diffuse front/back
 	v1 = isFrontFace ? xIn.iD1 : xIn.iB1; // Specular front/back
-	fog = float4(c_fog.rgb, clamp(fogFactor, 0, 1)); // color from PSH_XBOX_CONSTANT_FOG, alpha from vertex shader output / pixel shader input
+	fog = float4(c_fog.rgb, saturate(fogFactor)); // color from PSH_XBOX_CONSTANT_FOG, alpha from vertex shader output / pixel shader input
 
 	// Xbox shader program will be inserted here
     // <XBOX SHADER PROGRAM GOES HERE>

src/core/hle/D3D8/Direct3D9/FixedFunctionPixelShader.hlsl

@@ -302,7 +302,7 @@ float4 main(const PS_INPUT input) : COLOR {
 
 	// Add fog if enabled
 	if (state.FogEnable) {
-		ctx.CURRENT.rgb = lerp(state.FogColor.rgb, ctx.CURRENT.rgb, clamp(fogFactor, 0, 1));
+		ctx.CURRENT.rgb = lerp(state.FogColor.rgb, ctx.CURRENT.rgb, saturate(fogFactor));
 	}
 
 	// Add specular if enabled