演武台：修复bug

shared/db/BossInstance.ts

@@ -47,7 +47,7 @@ export default class BossInstance extends BaseModel {
     @prop({ required: true, default:[], type: String, _id: false})
     roleIdRecords: Array<string>; //记录提示过胜利boss关的玩家
 
-    @prop({ required: true })
+    @prop({ required: true, default: GUILD_BOSS_STATUS.OPEN })
     status: GUILD_BOSS_STATUS; // 状态 1：等待团长开启，2：今日已开启，且boss通关，3：开启中
 
     public static async findByCode(code: string) {