Fix DolphinClassic sample, by not making fogDepth absolute (thanks NZJenkins!)

(This bug was introduced with PR #2163, based on some misleading code in xqemu, to cater for what now appear to be non-supported fog modes on NV2A.)

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

@@ -332,7 +332,7 @@ R"DELIMITER(
 
 	// Fogging
 	// TODO deduplicate
-	const float fogDepth      =   abs(oFog.x); 
+	const float fogDepth      =   oFog.x; // Don't abs this value! Test-case : DolphinClassic xdk sample
 	const float fogTableMode  =   CxbxFogInfo.x;
 	const float fogDensity    =   CxbxFogInfo.y;
 	const float fogStart      =   CxbxFogInfo.z;