Bug 1699821 - Restore border to standalone search bar. r=mak

Differential Revision: https://phabricator.services.mozilla.com/D109350

browser/themes/shared/urlbarView.inc.css

@@ -740,15 +740,15 @@
 #PopupSearchAutoComplete {
   background: var(--autocomplete-popup-background);
   color: var(--autocomplete-popup-color);
+  border-color: var(--arrowpanel-border-color);
+}
+
+@supports -moz-bool-pref("browser.proton.urlbar.enabled") {
+#PopupSearchAutoComplete {
   border: 1px solid var(--arrowpanel-border-color);
   /* Remove the top border since the panel is flush with the input. */
   border-top-width: 0;
 }
-
-@supports not -moz-bool-pref("browser.proton.urlbar.enabled") {
-#PopupSearchAutoComplete {
-  border-width: 0;
-}
 } /*** END !proton ***/
 
 #PopupSearchAutoComplete .autocomplete-richlistitem[selected] {