add a migration for existing search-themes Shelves (#17006)

src/olympia/shelves/migrations/0015_auto_20210422_1032.py

@@ -0,0 +1,20 @@
+# Generated by Django 2.2.20 on 2021-04-22 10:32
+
+from django.db import migrations
+
+from olympia import amo
+
+
+def update_endpoint(apps, schema_editor):
+    Shelf = apps.get_model('shelves', 'Shelf')
+    for shelf in Shelf.objects.filter(endpoint='search-themes'):
+        shelf.update(endpoint='search', addon_type=amo.ADDON_STATICTHEME)
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('shelves', '0014_auto_20210416_2225'),
+    ]
+
+    operations = [migrations.RunPython(update_endpoint)]