fix(finance/admin): pass participant_count only once

jdav_web/finance/admin.py

@@ -116,7 +116,6 @@ class StatementUnSubmittedAdmin(CommonAdminMixin, admin.ModelAdmin):
                        opts=self.opts,
                        memberlist=memberlist,
                        object=memberlist,
-                       participant_count=memberlist.participant_count,
                        ljp_contributions=memberlist.payable_ljp_contributions,
                        total_relative_costs=memberlist.total_relative_costs,
                        **memberlist.statement.template_context())

jdav_web/finance/tests/admin.py

@@ -126,7 +126,6 @@ class StatementUnSubmittedAdminTestCase(AdminTestCase):
         self.assertEqual(response.status_code, HTTPStatus.OK)
         self.assertContains(response, _('Submit statement'))
 
-    @unittest.skip('Currently fails with TypeError, because `participant_count` is passed twice.')
     def test_submit_view_get_with_excursion(self):
         url = reverse('admin:finance_statementunsubmitted_submit',
                       args=(self.statement_with_excursion.pk,))