Fix all icons in the column header being hilighted (#3554)

app/javascript/styles/components.scss

@@ -2029,7 +2029,7 @@ button.icon-button.active i.fa-retweet {
     box-shadow: 0 1px 0 rgba($ui-highlight-color, 0.3);
   }
 
-  &.active .fa {
+  &.active .column-header__icon {
     color: $ui-highlight-color;
     text-shadow: 0 0 10px rgba($ui-highlight-color, 0.4);
   }