fix(admin-ui): Fix styling of custom field tabs

packages/admin-ui/src/lib/core/src/shared/components/tabbed-custom-fields/tabbed-custom-fields.component.scss

@@ -2,6 +2,6 @@
     display: contents;
 }
 
-//vdr-custom-field-control + vdr-custom-field-control {
-//    margin-top: calc(var(--space-unit) * 2);
-//}
+::ng-deep clr-tabs .btn.btn-link {
+    box-shadow: none;
+}