Disambiguation in kfet's permission handling

In some places we used to refer to permissions based on their codename
only (the part after the dot "." in the following examples) which can be
ambiguous. Typically, we might define permissions like "bds.is_team" or
"cof.is_team" in the near future ;)

kfet/management/commands/loadkfetdevdata.py

@@ -6,7 +6,7 @@ import os
 import random
 from datetime import timedelta
 
-from django.contrib.auth.models import ContentType, Group, Permission, User
+from django.contrib.auth.models import Group, Permission, User
 from django.core.management import call_command
 from django.utils import timezone
 
@@ -41,11 +41,9 @@ class Command(MyBaseCommand):
         group_chef.save()
         group_boy.save()
 
-        permissions_chef = Permission.objects.filter(
-            content_type__in=ContentType.objects.filter(app_label="kfet")
-        )
+        permissions_chef = Permission.objects.filter(content_type__app_label="kfet",)
         permissions_boy = Permission.objects.filter(
-            codename__in=["is_team", "perform_deposit"]
+            content_type__app_label="kfet", codename__in=["is_team", "perform_deposit"]
         )
 
         group_chef.permissions.add(*permissions_chef)