Add missing styling for `fa-icon-vflipped` class

Fixes the search widget down arrow's direction in asset viewer.

src/css/fa-icons.css

@@ -40,6 +40,9 @@
 .fa-icon.disabled > .fa-icon-badge {
     display: none;
     }
+.fa-icon.fa-icon-vflipped {
+    transform: scale(1, -1);
+    }
 
 .fa-icon > svg {
     height: 1em;