学员提交功能bug修复

src/components/UploadVideo.vue

@@ -170,6 +170,7 @@ export default {
     onDelete(value) {
       if (this.endpoint.filter(k => k.name === value.file.name).length === 0) {
         this.isShow = false
+        this.disabled = false
         this.$emit('fileStatus', this.isShow)
         if (this.uploader) {
           this.uploader.stopUpload()