Notifications: updates the reply icon for consistency with the latest…

… release of gridicons

src/templates/gridicons.jsx

@@ -194,7 +194,7 @@ export default React.createClass({
           <svg {...sharedProps} xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
             <title>Reply</title>
             <g>
-              <path d="M14 8H6.828l2.586-2.586L8 4 3 9l5 5 1.414-1.414L6.828 10H14c2.206 0 4 1.794 4 4s-1.794 4-4 4h-2v2h2c3.314 0 6-2.686 6-6s-2.686-6-6-6z" />
+              <path d="M9 16h7.2l-2.6 2.6L15 20l5-5-5-5-1.4 1.4 2.6 2.6H9c-2.2 0-4-1.8-4-4s1.8-4 4-4h2V4H9c-3.3 0-6 2.7-6 6s2.7 6 6 6z" />
             </g>
           </svg>
         );