fix： 修改 topoLogy 图片选择后 无法删除的问题

nezha-fronted/src/components/common/project/meta2d/meta2dElement.vue

@@ -1233,6 +1233,11 @@ export default {
         this.pen.image = ''
         this.change('icon')
       }
+      if (!image.id) {
+        this.pen.image = image.image
+        this.pen.icon = ''
+        this.change('image')
+      }
     },
     colorChange (val, key) {
       this.pen.data.params[key] = val