[FIX] pos & website_event_sale: fix some tests

Related to commit https://github.com/odoo/odoo/commit/0e881fcd3a5671c4fe84b2a47c9d3611e4b823a1

addons/point_of_sale/tests/test_frontend.py

@@ -33,7 +33,7 @@ class TestUi(odoo.tests.HttpCase):
         # euro's. this will cause issues as the sale journal is in
         # USD, because of this all products would have a different
         # price
-        main_company.currency_id = env.ref('base.USD')
+        cr.execute("UPDATE res_company SET currency_id = %s WHERE id = %s", [env.ref('base.USD').id, main_company.id])
 
         test_sale_journal = journal_obj.create({'name': 'Sale Journal - Test',
                                                 'code': 'TSJ',

addons/website_event_sale/tests/test_ui.py

@@ -12,7 +12,7 @@ class TestUi(odoo.tests.HttpCase):
         # - that main demo company is gelocated in US
         # - that this test awaits for hardcoded USDs amount
         # we have to force company currency as USDs only for this test
-        self.env.ref('base.main_company').write({'currency_id': self.env.ref('base.USD').id})
+        self.cr.execute("UPDATE res_company SET currency_id = %s WHERE id = %s", [self.env.ref('base.USD').id, self.env.ref('base.main_company').id])
         self.phantom_js("/", "odoo.__DEBUG__.services['web_tour.tour'].run('event_buy_tickets')", "odoo.__DEBUG__.services['web_tour.tour'].tours.event_buy_tickets.ready", login="admin")
 
     def test_demo(self):