Fix errors in log with 204 response endpoints.

FastAPI uses JsonResponse by default, which will convert the empty
response None to null. We need to forcibly use Response instead to
prevent that for No Content responses.

This didn't cause any observable issues but was polluting the log.

game/server/controlpoints/routes.py

@@ -3,6 +3,7 @@ from uuid import UUID
 from dcs import Point
 from dcs.mapping import LatLng
 from fastapi import APIRouter, Body, Depends, HTTPException, status
+from starlette.responses import Response
 
 from game import Game
 from .models import ControlPointJs
@@ -59,6 +60,7 @@ def destination_in_range(
     "/{cp_id}/destination",
     operation_id="set_control_point_destination",
     status_code=status.HTTP_204_NO_CONTENT,
+    response_class=Response,
 )
 def set_destination(
     cp_id: UUID,
@@ -98,6 +100,7 @@ def set_destination(
     "/{cp_id}/cancel-travel",
     operation_id="clear_control_point_destination",
     status_code=status.HTTP_204_NO_CONTENT,
+    response_class=Response,
 )
 def cancel_travel(cp_id: UUID, game: Game = Depends(GameContext.require)) -> None:
     cp = game.theater.find_control_point_by_id(cp_id)