[check_postgres] bug in txn_wraparound perfdata output

[Greg Sabino Mullane]

Crappy UTF-8 problems with git commit notwithstanding, I've applied this patch.
I also cleaned up the whole sub while I was at it. Please test heavily, this was
done quickly and has no unit test yet. Thanks!

-- 
Greg Sabino Mullane greg at endpoint.com 610-983-9073
End Point Corporation
PGP Key: 0x14964AC8

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