Print new OldestXID value in pg_resetwal when it's being changed

Commit 74cf7d46a9 added the --oldest-transaction-id option to
pg_resetwal, but forgot to update the code that prints all the new
values that are being set. Fix that.

Reviewed-by: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Discussion: https://www.postgresql.org/message-id/5461bc85-e684-4531-b4d2-d2e57ad18cba@iki.fi
Backpatch-through: 14

src/bin/pg_resetwal/pg_resetwal.c

@@ -857,6 +857,10 @@ PrintNewControlValues(void)
 	{
 		printf(_("NextXID:                              %u\n"),
 			   XidFromFullTransactionId(ControlFile.checkPointCopy.nextXid));
+	}
+
+	if (set_oldest_xid != 0)
+	{
 		printf(_("OldestXID:                            %u\n"),
 			   ControlFile.checkPointCopy.oldestXid);
 		printf(_("OldestXID's DB:                       %u\n"),