tests: adapt to changes in generated javascript in search cell (#18921)

tests/test_search.py

@@ -69,7 +69,7 @@ def test_search_cell(app):
         cell.slug = 'var-name'
         context = {'request': RequestFactory().get('/?q_var_name=searchme')}
         resp = cell.render(context)
-        assert "combo_search_input_%s.val('searchme');" % cell.pk in resp
+        assert "$input.val('searchme');" in resp
 
         with mock.patch('combo.apps.search.models.requests.get') as requests_get: