refactoring nits (#18188)

* no octal for time values

* rm artifact from refactoring

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

services/mailer/mailer_test.go

@@ -14,14 +14,14 @@ import (
 )
 
 func TestGenerateMessageID(t *testing.T) {
-	var mailService = setting.Mailer{
+	mailService := setting.Mailer{
 		From: "test@gitea.com",
 	}
 
 	setting.MailService = &mailService
 	setting.Domain = "localhost"
 
-	date := time.Date(2000, 01, 02, 03, 04, 05, 06, time.UTC)
+	date := time.Date(2000, 1, 2, 3, 4, 5, 6, time.UTC)
 	m := NewMessageFrom(nil, "display-name", "from-address", "subject", "body")
 	m.Date = date
 	gm := m.ToMessage()