winspool/tests: fix WRT-failures in test_DEVMODE

[Detlef Riekenberg]

- dmDeviceName can be truncated:
  http://msdn.microsoft.com/library/en-us/gdi/prntspol_8nle.asp
  WRT-Results: http://test.winehq.org/data/200604231000/#XP


- On NT3.51, some fields in DEVMODE are empty/zero


Changelog:
 winspool/tests: fix WRT-failures in test_DEVMODE

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      ... Detlef
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