fix：导入学生文件缓存问题

src/features/examwork/ExamStudentImport/ExamStudentImportDialog.vue

@@ -3,6 +3,7 @@
     ref="dialog"
     title="导入考生"
     width="540px"
+    destroy-on-close
     :visible.sync="visible"
     @close="closeDialog"
   >

src/features/examwork/InvigilateManagement/InvigilateManagement.vue

@@ -27,7 +27,7 @@
             type="primary"
             icon="icon icon-upload"
             @click="importDialog"
-            >导入考场设置</el-button
+            >导入监考设置</el-button
           >
           <el-button
             type="primary"