feat: hide authorizer for rental orders, auto-set sale type

Rental orders no longer show the "Authorizer Required?" question or
the Authorizer field. The sale type is automatically set to 'Rentals'
when creating or confirming a rental order. Validation logic also
skips authorizer checks for rental sale type.

Made-with: Cursor

fusion_poynt/views/sale_order_views.xml

@@ -14,6 +14,7 @@
                         class="btn-secondary"
                         icon="fa-credit-card"
                         invisible="state not in ('sale', 'done')"
+                        groups="fusion_poynt.group_fusion_poynt_user"
                         data-hotkey="p"/>
             </xpath>
         </field>