correct cart path

Signed-off-by: David Seaward <david.seaward@puri.sm>

cart/views.py

 # Django
+# 3rd party
+from captcha.fields import CaptchaField
+from django import forms
 from django.conf import settings
+from django.contrib.auth import get_user_model
 from django.contrib.auth import logout
 from django.http import HttpResponseRedirect
 from django.urls import reverse
-from django.utils.translation import ugettext_lazy as _
 from django.utils import timezone
-from django import forms
-from django.contrib.auth import get_user_model
-
-# 3rd party
-from captcha.fields import CaptchaField
-from ldapregister.forms import RegistrationForm
+from django.utils.translation import ugettext_lazy as _
 from registration.backends.simple.views import RegistrationView
 from registration.forms import validators
 
 # Others
 from cart.models import ChosenReward
+from ldapregister.forms import RegistrationForm
 from purist.models import AccountType
 
-
 User = get_user_model()
 
 
@@ -122,7 +120,7 @@ class CartRegistrationView(RegistrationView):
         else:
             # go to WooCommerce cart URL
 
-            url = '{}/{}/{}?{}&reauth=1'.format(
+            url = '{}/{}/{}/{}&reauth=1'.format(
                 settings.WOO_URL,
                 'wp-login.php?redirect_to=',
                 settings.WOO_CART_BILLING_PATH,