fix：删除冗余代码+创建房间表单默认不选择

src/pages/battle-room.vue

@@ -10,7 +10,6 @@ import ScreenHint from "@/components/ScreenHint.vue";
 import {
   getRoomAPI,
   exitRoomAPI,
-  startRoomAPI,
   chooseTeamAPI,
   getReadyAPI,
   kickPlayerAPI,
@@ -208,10 +207,6 @@ const chooseTeam = async (team) => {
   refreshMembers(result.members);
 };
 
-const exitRoom = async () => {
-  uni.navigateBack();
-};
-
 /** 待确认踢出的玩家信息 */
 const playerToKick = ref(null);
 /** 控制踢出确认弹窗的显示状态 */