tests: update as mail templates are now enabled by default (#41307)

tests/test_mail_templates.py

@@ -66,6 +66,11 @@ def mail_templates_option(pub):
 
 
 def test_mail_templates_disabled(pub, superuser):
+    if not pub.site_options.has_section('options'):
+        pub.site_options.add_section('options')
+    pub.site_options.set('options', 'mail-templates', 'false')
+    with open(os.path.join(pub.app_dir, 'site-options.cfg'), 'w') as fd:
+        pub.site_options.write(fd)
     app = login(get_app(pub))
     resp = app.get('/backoffice/workflows/')
     assert 'Mail Templates' not in resp