[FIX] website_mass_mailing: adapt snippet options

The snippet options UI was not adapted to the new web_editor UI.

closes odoo/odoo#37250

Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

addons/website_mass_mailing/views/snippets_templates.xml

@@ -70,12 +70,12 @@
         <div data-js="mailing_list_subscribe"
             t-att-data-selector="selector"
             t-attf-data-exclude=".o_newsletter_modal #{selector}">
-            <a tabindex="-1" href="#" class="dropdown-item" data-select_mailing_list="" data-no-preview="true">Change Newsletter</a>
+            <we-button data-select_mailing_list="" data-no-preview="true">Change Newsletter</we-button>
         </div>
         <div t-att-data-selector="selector" data-drop-near="p, h1, h2, h3, blockquote, .card"/>
         <div data-js="newsletter_popup"
             data-selector=".o_newsletter_popup">
-            <a tabindex="-1" href="#" class="dropdown-item" data-select_mailing_list="" data-no-preview="true">Change Newsletter</a>
+            <we-button data-select_mailing_list="" data-no-preview="true">Change Newsletter</we-button>
         </div>
     </xpath>
 </template>