Update aggrid.widget.js

Closes #3381000

js/aggrid.widget.js

@@ -127,7 +127,7 @@
 
         // If aggrid instance is already registered on Element. There is no
         // need to register it again.
-        if (once('aggridDiv', 'body').length !== aggridDiv.length) {
+        if (once('aggridDiv', '#' + item +'').length !== aggridDiv.length) {
            return;
         }
 
@@ -1507,7 +1507,7 @@
         let aggridTable = $('#' + item);
 
         // Only run this once.
-        if (once('aggridTable', 'body').length !== aggridTable.length) {
+        if (once('aggridTable', '#' + item +'').length !== aggridTable.length) {
           return;
         }