[IMP] website, *: hide overlay button when toolbar is active

`*=html_builder, html_editor`

- Hide overlay buttons when editor toolbar is active as this leads to
  a confusion for users.

task-4789254

Author: gppa-odoo

addons/html_builder/static/src/core/overlay_buttons/overlay_buttons.xml

@@ -4,7 +4,6 @@
     <div t-att-class="{'d-none': !state.showUi or !state.isVisible}" class="o-we-toolbar o_overlay_options shadow rounded my-2">
         <t t-foreach="state.buttons" t-as="button" t-key="button_index">
             <!-- Disabled buttons do not display their title -->
-            <span class="o-we-toolbar-vertical-separator"></span>
             <span class="btn-group" t-att-title="button.disabledReason" t-att-aria-label="button.disabledReason">
                 <t t-if="button.Component" t-component="button.Component" t-props="button.props || {}"/>
                 <t t-else="">