[IMP] sale: form view's spacing on small screens

This commit adds some margins before the "Terms & conditions" field for
better readability and visual balance (specifically when buttons appear
before terms field) on small screens.

Task ID: 2152164

closes odoo/odoo#41898

Related: odoo/enterprise#7274
Signed-off-by: Pierre Paridans <pparidans@users.noreply.github.com>

addons/sale/views/sale_views.xml

@@ -628,7 +628,7 @@
                                     </templates>
                                 </kanban>
                             </field>
-                            <group name="note_group" col="6">
+                            <group name="note_group" col="6" class="mt-2 mt-md-0">
                                 <group colspan="4">
                                     <field name="note" nolabel="1" placeholder="Terms and conditions..."/>
                                 </group>