STYLE: Apply kwstyle to Modules/Registration 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 tests.

Change-Id: I444e161fdd51e73d85accba48174ef43bbec94b9
Merge topic 'StyleForRegistration'

5c1c2a7 STYLE: Apply kwstyle to Modules/Registration tests