Fix preprocess code

src/Shaders/ShadersInclude/shadowMapFragmentDeclaration.fx

@@ -4,7 +4,7 @@
 
 varying float vDepthMetricSM;
 
-#ifdef SM_USEDISTANCE == 1
+#if SM_USEDISTANCE == 1
     uniform vec3 lightDataSM;
     varying vec3 vPositionWSM;
 #endif
@@ -12,6 +12,6 @@ varying float vDepthMetricSM;
 uniform vec3 biasAndScaleSM;
 uniform vec2 depthValuesSM;
 
-#ifdef SM_DEPTHCLAMP == 1
+#if SM_DEPTHCLAMP == 1
     varying float zSM;
 #endif