USER32: Error checking for sysparams tests

[jchevrier at nexicom.net]

As discussed on wine-devel there are a handful of calls in the 
SystemParametersInfo tests that don't check for returned errors and continue 
on with testing a given parameter. This patch ensures that all initial calls 
to SystemParametersInfoA in each parameter test have their returned errors 
checked. To ease adding more error cases and reduce code duplication I have 
consolidated error message handling into a single function.

Changelog:

* Consolidate error message handling
* Add error checking to all initial SystemParametersInfoA calls in each 
parameter test to make sure that if a given parameter isn't supported or has 
failed in some other way that we return and don't continue on with the test
* Remove a couple of TABS and align registry keys/values at the top of the 
file
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