Bug 1881124 - Fix selecting newly created tag in general settings. r=mkmelin

Differential Revision: https://phabricator.services.mozilla.com/D202432

--HG--
extra : rebase_source : 06be251a20663640386a5e86749724d639f404c8

mail/components/preferences/general.js

@@ -2931,7 +2931,7 @@ function addTagCallback(aName, aColor) {
   // Add to style sheet.
   const key = MailServices.tags.getKeyForTag(aName);
   const tagListBox = document.getElementById("tagList");
-  const item = tagListBox.querySelector(`richlistitem[value=${key}]`);
+  const item = tagListBox.querySelector(`richlistitem[value="${key}"]`);
   tagListBox.ensureElementIsVisible(item);
   tagListBox.selectItem(item);
   tagListBox.focus();