tests: fix targeting of login form now that it moved

tests/utils.py

@@ -9,7 +9,7 @@ def login(app, user, path=None, password=None, remember_me=None):
     else:
         login_page = app.get(reverse('auth_login'))
     assert login_page.request.path == reverse('auth_login')
-    form = login_page.forms[0]
+    form = login_page.forms[1]
     form.set('username', user.username if hasattr(user, 'username') else user)
     # password is supposed to be the same as username
     form.set('password', password or user.username)