[mastodon] Fix delete endpoint for mastodon

backend/src/kibicara/platforms/mastodon/webapi.py

@@ -101,6 +101,12 @@ async def mastodon_read_all(hood=Depends(get_hood)):
 )
 async def mastodon_delete(mastodon=Depends(get_mastodon)):
     spawner.stop(mastodon)
+    await mastodon.instance.load()
+    object_with_instance = await MastodonAccount.objects.filter(
+        instance=mastodon.instance
+    ).all()
+    if len(object_with_instance) == 1 and object_with_instance[0] == mastodon:
+        await mastodon.instance.delete()
     await mastodon.delete()
     return Response(status_code=status.HTTP_204_NO_CONTENT)