Bug 1959121 - Don't forget previously open sidebar panels for legacy sidebar.revamp=false sidebars. r=sidebar-reviewers,sclements

Differential Revision: https://phabricator.services.mozilla.com/D245006

browser/components/sidebar/browser-sidebar.js

@@ -1753,7 +1753,7 @@ var SidebarController = {
    *                                        hiding of the sidebar.
    * @param {boolean} options.dismissPanel -Only close the panel or close the whole sidebar (the default.)
    */
-  hide({ triggerNode, dismissPanel = true } = {}) {
+  hide({ triggerNode, dismissPanel = this.sidebarRevampEnabled } = {}) {
     if (!this.isOpen) {
       return;
     }