WebUI: Use Map instead of Mootools Hash in all dynamic tables

PR #21358.

src/webui/www/private/views/searchplugins.html

@@ -202,7 +202,7 @@
             // clear event listeners
             setupSearchPluginTableEvents(false);
 
-            const oldPlugins = Object.keys(searchPluginsTable.rows);
+            const oldPlugins = [...searchPluginsTable.getRowIds()];
             // remove old rows from the table
             for (let i = 0; i < oldPlugins.length; ++i) {
                 let found = false;