Fix duplicate dropdown dividers (#32760)

Fix #27466

The problem is that any item in the menu could be hidden, pure CSS won't
work, and dropdown's builtin "hideDividers" doesn't work with our "scope
dividers". The newly introduced "archived" label makes the dividers
regression more.

web_src/js/webcomponents/overflow-menu.ts

@@ -12,7 +12,7 @@ window.customElements.define('overflow-menu', class extends HTMLElement {
   mutationObserver: MutationObserver;
   lastWidth: number;
 
-  updateItems = throttle(100, () => { // eslint-disable-line unicorn/consistent-function-scoping -- https://github.com/sindresorhus/eslint-plugin-unicorn/issues/2088
+  updateItems = throttle(100, () => {
     if (!this.tippyContent) {
       const div = document.createElement('div');
       div.classList.add('tippy-target');