Add autocomplete attribute to password fields

This helps the browser autocomplete them with the right thing.

Value based on https://www.w3.org/TR/WCAG21/#input-purposes

app/templates/views/organisations/organisation/settings/edit-name/confirm.html

@@ -19,7 +19,7 @@
     <div class="column-three-quarters">
 
     {% call form_wrapper() %}
-      {{ textbox(form.password) }}
+      {{ textbox(form.password, autocomplete='current-password') }}
       <p> Your organisation name will be changed from {{ current_org.name }} to {{ new_name }} </p>
       {{ page_footer('Confirm') }}
     {% endcall %}