Box3Helper: Fix invalid character.

src/helpers/Box3Helper.js

@@ -15,7 +15,7 @@ function Box3Helper( box, color ) {
 
 	this.box = box;
 
-	color = color || 0xffff00;
+	color = color || 0xffff00;
 
 	var indices = new Uint16Array( [ 0, 1, 1, 2, 2, 3, 3, 0, 4, 5, 5, 6, 6, 7, 7, 4, 0, 4, 1, 5, 2, 6, 3, 7 ] );