[FIX] website_form: allow to add form snippet inside columns

closes odoo/odoo#61787

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

addons/website_form/views/snippets/s_website_form.xml

@@ -18,6 +18,9 @@
 </template>
 
 <template id="s_website_form_options" inherit_id="website.snippet_options">
+    <!-- Extend drop locations to columns -->
+    <xpath expr="//t[@t-set='so_content_addition_selector']" position="inside">, .s_website_form</xpath>
+
     <xpath expr="//div" position="after">
         <!-- Form -->
         <div data-js="WebsiteFormEditor" data-selector=".s_website_form" data-target="form">