fix(popup): Fix tag/project dropdown toggle

There are two event handlers configured that are triggering the popdown (by calling the 'toggleDropdown' function):

 1. A focus event configured in the class 'TB_Dialog_field' (parent of the element with id 'toggl-button-(tag|project)-placeholder')
 2. A click event configured in the element with id 'toggl-button-(tag|project)-placeholder'

This commit removes the 'focus' event handler from 'TB_Dialog_field', since it seems that it's no longer necessary.
Another possible solution would be to add a 'e.stopPropagation' on the click event handler.

Closes #1422

src/scripts/popup.js

@@ -409,18 +409,6 @@ window.PopUp = {
         e.preventDefault();
       });
 
-    document
-      .querySelector('#toggl-button-project-placeholder')
-      .closest('.TB__Dialog__field')
-      .addEventListener('focus', (e) => {
-        PopUp.$projectAutocomplete.openDropdown();
-      });
-    document
-      .querySelector('#toggl-button-tag-placeholder')
-      .closest('.TB__Dialog__field')
-      .addEventListener('focus', (e) => {
-        PopUp.$tagAutocomplete.openDropdown();
-      });
     document
       .querySelector('#toggl-button-duration')
       .addEventListener('focus', (e) => {