[Fix] Clear Reply content after post successfully

Author: Harry-zklcdc

src/pages/oj/views/forum/Forum.vue

@@ -314,6 +314,7 @@
         api.submitFourmReply(data).then(res => {
           this.submitting = false
           this.$success('Success')
+          this.forumreply.content = ''
           this.forumreplys.unshift(res.data.data)
         }, () => {
           this.submitting = false