取消助理，房间assistantId 为空

src/controller/room/assistant.js

@@ -84,7 +84,7 @@ export class RoomAssistant {
       const role = cancel ? "customer" : "assistant";
       //  assistant是助手，customer是普通角色，操作role会好些
       const userObj = Object.assign({}, user, { role: role, order: 1 });
-      const roomObj = Object.assign({}, roomConfigRes, { assistantId: user.userId });
+      const roomObj = Object.assign({}, roomConfigRes, { assistantId: cancel ? null : user.userId });
       // console.log("setAssistant", userObj, roomObj);
       // console.error("roomObj", roomObj);
       await updateRoomUser(roomId, userId, userObj);