Always set Web UI row id as a string

This helps ensure consistent behavior when performing rowId comparisons against strings.

src/webui/www/private/scripts/dynamicTable.js

@@ -617,7 +617,8 @@ window.qBittorrent.DynamicTable = (function() {
         onSelectedRowChanged: function() {},
 
         updateRowData: function(data) {
-            const rowId = data['rowId'];
+            // ensure rowId is a string
+            const rowId = `${data['rowId']}`;
             let row;
 
             if (!this.rows.has(rowId)) {