[FIX] purchase: not setting context is not empty context

Previous versions of this action had a context. It was removed at
odoo/odoo@2d3e6d7383 Set explicitly an empty context to
force the removal when upgrading the module. Fine tunning of
odoo/odoo@9346563009

closes odoo/odoo#43319

X-original-commit: 63a5a795a57af0da3b7459e0acd83a247861eaf3
Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>

addons/purchase/views/purchase_views.xml

@@ -549,6 +549,7 @@
             <field name="view_mode">tree,kanban,form,pivot,graph,calendar,activity</field>
             <field name="view_id" ref="purchase_order_tree"/>
             <field name="domain">[]</field>
+            <field name="context">{}</field>
             <field name="search_view_id" ref="view_purchase_order_filter"/>
             <field name="context">{'quotation_only': True}</field>
             <field name="help" type="html">
@@ -572,6 +573,7 @@
             <field name="view_id" ref="purchase_order_view_tree"/>
             <field name="domain">[('state','in',('purchase', 'done'))]</field>
             <field name="search_view_id" ref="purchase_order_view_search"/>
+            <field name="context">{}</field>
             <field name="help" type="html">
               <p class="o_view_nocontent_smiling_face">
                 Create a quotation