修复平曲线bug

src/views/gauge/bezier.vue

@@ -523,6 +523,7 @@ const getTypeName = (val) => {
 }
 //添加线元
 const addLineEleModal = () => {
+    formLineEleValue.value = { type: 0 }
     saveLoading.value = false
     showLineEleModal.value = true
     getNextMileagexy()