Merge pull request '优化，导出文件多了一个Sheet1的页面，去掉' (#846) from fix-828 into V20211115

Reviewed-on: https://git.openi.org.cn/OpenI/aiforge/pulls/846
Reviewed-by: lewis <747342561@qq.com>

routers/api/v1/repo/repo_dashbord.go

@@ -205,6 +205,7 @@ func ServeAllProjectsPeriodStatisticsFile(ctx *context.Context) {
 
 	}
 	f.SetActiveSheet(index)
+	f.DeleteSheet("Sheet1")
 
 	if err := f.SaveAs(fileName); err != nil {
 		log.Error("Can not generate file.", err)