Hide the default field from the collectivity form (fixes #7582)

src/authentic2_pratic/forms.py

@@ -47,7 +47,7 @@ class CertificateMixin(forms.ModelForm):
 class CollectivityForm(CertificateMixin, BaseForm):
     class Meta:
         model = models.Collectivity
-        exclude = ('uuid',)
+        exclude = ('uuid', 'default')
 
 class ServiceInstanceForm(BaseForm):
     class Meta: