STYLE: Apply kwstyle to Modules/IO tests

KWStyle was not checking tests. However, the git hook for KWStyle did
check tests if they were modified. This topic cleans itk tests and
reduces developer frustration when committing changes to test.

Change-Id: Iac1aabf8bcf551559c8a4499f2ba282b0576e21e
Merge topic 'StyleForIO'

740dcea STYLE: Apply kwstyle to Modules/IO tests