CubeCamera: Clean up.

src/cameras/CubeCamera.js

@@ -11,14 +11,14 @@ import { PerspectiveCamera } from './PerspectiveCamera.js';
  * @author alteredq / http://alteredqualia.com/
  */
 
+var fov = 90, aspect = 1;
+
 function CubeCamera( near, far, cubeResolution, options ) {
 
 	Object3D.call( this );
 
 	this.type = 'CubeCamera';
 
-	var fov = 90, aspect = 1;
-
 	var cameraPX = new PerspectiveCamera( fov, aspect, near, far );
 	cameraPX.up.set( 0, - 1, 0 );
 	cameraPX.lookAt( new Vector3( 1, 0, 0 ) );