fix: 修复 picker 组件的 value属性不传值返回信息错误的问题

src/core/view/components/picker/index.vue

@@ -111,7 +111,7 @@ export default {
   },
   data () {
     return {
-      valueSync: this.value,
+      valueSync: this.value || 0,
       visible: false,
       valueChangeSource: ''
     }