fix: dateFormatter2在vscode中爆红的问题

1. 下划线开始的变量可以避免提示变量未使用
2. 比较奇怪，dateFormatter在vscode上不会爆红，dateFormatter2会。都加上类型定义吧


Signed-off-by: dhb52 <dhb52@126.com>

src/utils/formatTime.ts

@@ -1,4 +1,5 @@
 import dayjs from 'dayjs'
+import type { TableColumnCtx } from 'element-plus'
 
 /**
  * 日期快捷选项适用于 el-date-picker
@@ -199,8 +200,7 @@ export function formatPast2(ms) {
  * @param column 字段
  * @param cellValue 字段值
  */
-// @ts-ignore
-export const dateFormatter = (row, column, cellValue): string => {
+export const dateFormatter = (_row: any, _column: TableColumnCtx<any>, cellValue: any): string => {
   if (!cellValue) {
     return ''
   }
@@ -214,10 +214,9 @@ export const dateFormatter = (row, column, cellValue): string => {
  * @param column 字段
  * @param cellValue 字段值
  */
-// @ts-ignore
-export const dateFormatter2 = (row, column, cellValue) => {
+export const dateFormatter2 = (_row: any, _column: TableColumnCtx<any>, cellValue: any): string => {
   if (!cellValue) {
-    return
+    return ''
   }
   return formatDate(cellValue, 'YYYY-MM-DD')
 }