code style

src/renderers/webgl/WebGLProgram.js

@@ -341,6 +341,7 @@ function generateEnvMapModeDefine( parameters ) {
 			case CubeRefractionMapping:
 			case EquirectangularRefractionMapping:
 			case CubeUVRefractionMapping:
+
 				envMapModeDefine = 'ENVMAP_MODE_REFRACTION';
 				break;