Fix correlation_matrix test

git-svn-id: https://svn.code.sf.net/p/rkward/code@4863 7936002b-cd1d-0410-9ce3-d7ebf93b5162
one closing bracket to many?

git-svn-id: https://svn.code.sf.net/p/rkward/code@4864 7936002b-cd1d-0410-9ce3-d7ebf93b5162