Shaders: SpotLight no longer uses vWorldPosition. See #7419.

src/renderers/shaders/ShaderChunk/lights_phong_pars_fragment.glsl

@@ -1,4 +1,4 @@
-#if MAX_SPOT_LIGHTS > 0 || defined( USE_ENVMAP )
+#ifdef USE_ENVMAP
 
 	varying vec3 vWorldPosition;
 

src/renderers/shaders/ShaderChunk/lights_phong_pars_vertex.glsl

@@ -1,4 +1,4 @@
-#if MAX_SPOT_LIGHTS > 0 || defined( USE_ENVMAP )
+#ifdef USE_ENVMAP
 
 	varying vec3 vWorldPosition;
 

src/renderers/shaders/ShaderChunk/lights_phong_vertex.glsl

@@ -1,4 +1,4 @@
-#if MAX_SPOT_LIGHTS > 0 || defined( USE_ENVMAP )
+#ifdef USE_ENVMAP
 
 	vWorldPosition = worldPosition.xyz;