fix(aura): drive blur via @media instead of broken argument

views/partials/aura-bg.php

@@ -14,12 +14,10 @@
  */
 
 namespace KsPortfolio;
-
-$blur = isset( $blur ) && 'desktop' === $blur ? 'aura-layer-2--desktop' : 'aura-layer-2--mobile';
 ?>
 <div class="aura-bg" aria-hidden="true">
 	<div class="aura-layer-1"></div>
-	<div class="aura-layer-2 <?php echo esc_attr( $blur ); ?>"></div>
+	<div class="aura-layer-2"></div>
 	<div class="aura-grain">
 		<svg width="100%" height="100%" xmlns="http://www.w3.org/2000/svg" aria-hidden="true">
 			<filter id="aura-grain-filter">