add delete btn

@@ -751,6 +751,7 @@
                                     <label>背景图</label>
                                     <input type="file" name="file" value="[[item.backgroundImage]]"
                                            data-field="[[index]].backgroundImage" data-index="[[index]]" />
+                                    <button class="btn btn-danger btn-sm delBtnFileListImg" data-event="guessLike.list" type="button" data-index="[[index]]" data-key="backgroundImage">删除图片</button>
                                 </div>
                             </div>
                         </div>