NEZ-1594 fix：Chart templates新增数据后，单击编辑按钮Metric内表达式消失

nezha-fronted/src/components/common/rightBox/chart/chartConfig.vue

@@ -779,6 +779,7 @@ export default {
         this.chartConfig.elements.forEach(item => {
           this.addExpression(item)
         })
+        this.expressionChange()
       }
     },
     chartTypeChange (type) {

nezha-fronted/src/components/common/rightBox/chart/chartRightBox.vue

@@ -402,7 +402,8 @@ export default {
         name: this.editChart.name,
         remark: this.editChart.remark,
         groupId: this.editChart.groupId,
-        panelName: this.editChart.panelName
+        panelName: this.editChart.panelName,
+        varType: this.editChart.varType
       }
     },
     preview (show) {