Fix and clarify redirect HTTP logic

redirect-http seemed to suggest the Pages daemon would redirect from HTTPS to HTTP, but it seems that the opposite was implied.

Fixes issue manifested by https://gitlab.com/gitlab-org/omnibus-gitlab/merge_requests/1348

helpers_test.go

@@ -202,9 +202,7 @@ func getPagesArgs(t *testing.T, listeners []ListenSpec, promPort string, extraAr
 		args = append(args, "-daemon-gid", "65534") // Root user can switch to "nobody"
 	}
-	for _, argument := range extraArgs {
-		args = append(args, argument)
-	}
+	args = append(args, extraArgs...)
 	return
 }