Revert "Optimize events on handler"

The targets might not yet be present in the DOM
during initialization. Delegating to the time of
the event fixes issues with the node tree.

This reverts commit 006454a.

app/javascript/alchemy_admin/utils/events.js

@@ -1,8 +1,7 @@
 export function on(eventName, baseSelector, targetSelector, callback) {
   document.querySelectorAll(baseSelector).forEach((baseNode) => {
-    const targets = Array.from(baseNode.querySelectorAll(targetSelector))
-
     baseNode.addEventListener(eventName, (evt) => {
+      const targets = Array.from(baseNode.querySelectorAll(targetSelector))
       let currentNode = evt.target
 
       while (currentNode !== baseNode) {