Remove pretixdroid code

src/pretix/plugins/pretixdroid/migrations/0004_delete_appconfiguration.py

@@ -0,0 +1,16 @@
+# Generated by Django 3.0.9 on 2020-10-06 16:23
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixdroid', '0003_appconfiguration_squashed_0005_auto_20180106_2122'),
+    ]
+
+    operations = [
+        migrations.DeleteModel(
+            name='AppConfiguration',
+        ),
+    ]