MC-5383: Option Menus, Heading Inline Editor & tinyMCE Inline Editor Are Cut Off on Full Screen View

- Corrected heading toolbar divider

Author: Hwashiang Yu

app/code/Magento/PageBuilder/view/adminhtml/web/css/source/_toolbar.less

@@ -56,8 +56,11 @@
             &:not(:first-child):before {
                 background-color: @color-light-gray;
                 content: '';
+                height: 80%;
                 left: 0;
+                max-height: 32px;
                 position: relative;
+                top: 10%;
                 width: 1px;
             }