COMP: Remove unused variable

itkLevelSetEvolution.hxx(286): warning #177: variable "it" was declared but never referenced
    typename LevelSetContainerType::Iterator it = this->m_LevelSetContainer->Begin();

Change-Id: I7f520476af3f7961463435877134b425da8c5537
Merge topic 'RemoveICCCompWarnings'

8895a8b COMP: Remove unused variable