Add expand on tree view

and unify layout of form view.

issue8644
review262131002

view/vat_customer_list.xml

@@ -3,7 +3,7 @@
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 <tree>
     <field name="company_tax_identifier" tree_invisible="1"/>
-    <field name="party_tax_identifier"/>
+    <field name="party_tax_identifier" expand="1"/>
     <field name="turnover"/>
     <field name="vat"/>
     <field name="currency"/>