fix small oversight in sbt-header config
fix small oversight in sbt-header config

after this change, `headerCreateAll` makes no changes.
we don't bother with headers in the test/junit directory.

scala/scala,lrytz/scala,lrytz/scala,lrytz/scala,lrytz/scala,lrytz/scala,scala/scala,scala/scala,scala/scala,scala/scala,scala/scala,lrytz/scala