Fix edge case where settings/admin page sidebar would be incorrectly hidden (#17580)

app/javascript/packs/public.js

@@ -276,13 +276,7 @@ function main() {
   });
 
   delegate(document, '.sidebar__toggle__icon', 'click', () => {
-    const target = document.querySelector('.sidebar ul');
-
-    if (target.style.display === 'block') {
-      target.style.display = 'none';
-    } else {
-      target.style.display = 'block';
-    }
+    document.querySelector('.sidebar ul').classList.toggle('visible');
   });
 
   // Empty the honeypot fields in JS in case something like an extension

app/javascript/styles/mastodon/admin.scss

@@ -322,6 +322,10 @@ $content-width: 840px;
 
       & > ul {
         display: none;
+
+        &.visible {
+          display: block;
+        }
       }
 
       ul a,