Fix typo.

biscuit/core/forms.py

@@ -48,7 +48,7 @@ class EditPersonForm(forms.ModelForm):
         model = Person
         fields = ['user', 'is_active', 'first_name', 'last_name', 'additional_name', 'short_name', 'street', 'housenumber',
                   'postal_code', 'place', 'phone_number', 'mobile_number', 'email', 'date_of_birth', 'sex', 'photo', 'photo_cropping']
-        widget = {
+        widgets = {
             'user': Select2Widget
         }