always use FilteredSelectMultiple for many-to-many fields

passbook/password_expiry_policy/forms.py

@@ -1,6 +1,7 @@
 """passbook PasswordExpiry Policy forms"""
 
 from django import forms
+from django.contrib.admin.widgets import FilteredSelectMultiple
 from django.utils.translation import gettext as _
 
 from passbook.core.forms.policies import GENERAL_FIELDS
@@ -18,6 +19,7 @@ class PasswordExpiryPolicyForm(forms.ModelForm):
             'name': forms.TextInput(),
             'order': forms.NumberInput(),
             'days': forms.NumberInput(),
+            'policies': FilteredSelectMultiple(_('policies'), False)
         }
         labels = {
             'deny_only': _("Only fail the policy, don't set user's password.")