Fix batch lock feature

The id for the Tailwind modal pane changed, and this caused the batch
lock feature to no longer work. This CL fixes the issue by changing the
id to the new one.

Reported at
https://groups.google.com/g/twpowertools-discuss/c/MHBh11eaxoM.

Change-Id: I6c75d3aaef55ce0eadb4c2aeeca5e0e21c03c48d
diff --git a/src/contentScripts/communityConsole/utils/common.js b/src/contentScripts/communityConsole/utils/common.js
index e1d417b..3d2bac5 100644
--- a/src/contentScripts/communityConsole/utils/common.js
+++ b/src/contentScripts/communityConsole/utils/common.js
@@ -3,7 +3,7 @@
 import {createPlainTooltip} from '../../../common/tooltip.js';
 
 export function removeChildNodes(node) {
-  while (node.firstChild) {
+  while (node?.firstChild) {
     node.removeChild(node.firstChild);
   }
 }