Allow transfer for patients defaults to true if peacetime, else `…

…false` (#1269)

* fixes coronasafe/care#5381

* Revert "fixes coronasafe/care#5381"

This reverts commit 0826c4d.

* set default via serializer based on PEACETIME

care/facility/api/serializers/patient.py

@@ -1,5 +1,6 @@
 import datetime
 
+from django.conf import settings
 from django.db import transaction
 from django.utils.timezone import localtime, make_aware, now
 from rest_framework import serializers
@@ -213,6 +214,8 @@ class Meta:
         queryset=User.objects.all(), required=False, allow_null=True
     )
 
+    allow_transfer = serializers.BooleanField(default=settings.PEACETIME_MODE)
+
     class Meta:
         model = PatientRegistration
         exclude = (