Allow passcode invalid error to appear (#14371)

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

routers/user/setting/security_twofa.go

@@ -195,7 +195,7 @@ func EnrollTwoFactorPost(ctx *context.Context, form auth.TwoFactorAuthForm) {
 			return
 		}
 		ctx.Flash.Error(ctx.Tr("settings.passcode_invalid"))
-		ctx.HTML(200, tplSettingsTwofaEnroll)
+		ctx.Redirect(setting.AppSubURL + "/user/settings/security/two_factor/enroll")
 		return
 	}