podjango: Use or_ instead of lambda

Easier to read.

conservancy/podjango/views.py

@@ -18,6 +18,7 @@
 #
 from datetime import datetime
 from functools import reduce
+from operator import or_
 
 from django.shortcuts import get_object_or_404, render
 from django.views.generic.list import ListView
@@ -27,7 +28,7 @@ from .models import Cast, CastTag
 
 def OR_filter(field_name, objs):
     from django.db.models import Q
-    return reduce(lambda x, y: x | y,
+    return reduce(or_,
                   [Q(**{field_name: x.id}) for x in objs])
 
 def last_name(person):