Fix coding standards issue

Author: Stanislav Idolov

app/design/frontend/Magento/luma/Magento_Theme/web/css/source/_module.less

@@ -261,10 +261,10 @@
     .copyright {
         .lib-css(background-color, @copyright__background-color);
         .lib-css(color, @color-white);
+        box-sizing: border-box;
         display: block;
         padding: @indent__s;
         text-align: center;
-        box-sizing: border-box;
     }
 
     .page-header,