[IMP] estate: remove buttons from view if property is cancelled or sold

Author: aurb9

estate/views/estate_property_views.xml

@@ -7,9 +7,9 @@
             <form string="Property">
                 <header>
                     <button name="action_set_sold" type="object" string="SOLD" class="oe_highlight"
-                            invisible="state == 'sold'"/>
+                            invisible="state in ['sold', 'cancelled']"/>
                     <button name="action_set_cancelled" type="object" string="CANCEL" class="oe_highlight"
-                            invisible="state == 'sold'"/>
+                            invisible="state in ['sold', 'cancelled']"/>
                     <field name="state" widget="statusbar" statusbar_visible="new,offer_received,offer_accepted,sold"/>
                 </header>
                 <sheet>