kiji-model-repository: KIJIREPO-41. Update to reflect KijiScoring constant name change

issue: https://jira.kiji.org/browse/KIJIREPO-41
review: https://review.kiji.org/r/1663
commit: https://github.com/kijiproject/kiji-model-repository/commit/21cb50f6a65e90780c00e886b2fe27b9e8b04795