WIP: show discrepancy between device_id and client_id

src/api/client/keys.rs

@@ -75,7 +75,8 @@ pub(crate) async fn upload_keys_route(
 		}
 		if deser_device_keys.device_id != sender_device {
 			return Err!(Request(Unknown(
-				"Device ID in keys uploaded does not match your own device ID"
+				"Device ID in keys uploaded ({}) does not match your own device ID ({})",
+				deser_device_keys.device_id, sender_device,
 			)));
 		}