fix: 修复学员管理性别显示错误的问题

src/pages/student/index.vue

@@ -195,7 +195,7 @@ export default {
             label: '性别',
             minWidth: '60px',
             computed({ row }) {
-              return genderMap[row.gender || 2]
+              return genderMap[row.gender] || row.gender
             }
           },
           { prop: 'age', label: '年龄', minWidth: '60px' },