displacementmap_vertex: Add spacing

src/renderers/shaders/ShaderChunk/displacementmap_vertex.glsl

@@ -1,5 +1,5 @@
 #ifdef USE_DISPLACEMENTMAP
 
-	transformed += normalize(objectNormal) * ( texture2D( displacementMap, uv ).x * displacementScale + displacementBias );
+	transformed += normalize( objectNormal ) * ( texture2D( displacementMap, uv ).x * displacementScale + displacementBias );
 
 #endif