handle serde_json for deserialized()

Signed-off-by: Jason Volk <jason@zemos.net>

src/service/appservice/data.rs

@@ -40,7 +40,7 @@ impl Data {
 		self.id_appserviceregistrations
 			.qry(id)
 			.await
-			.deserialized_json()
+			.deserialized()
 			.map_err(|e| err!(Database("Invalid appservice {id:?} registration: {e:?}")))
 	}