Removed unused code from normal map shader.

src/extras/ShaderUtils.js

@@ -320,8 +320,6 @@ THREE.ShaderUtils = {
 
 				"void main() {",
 
-					"vec4 mPosition = objectMatrix * vec4( position, 1.0 );",
-
 					"vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );",
 
 					"vViewPosition = -mvPosition.xyz;",