kiji-express: EXP-428. typo in run command of schema-shell

issue: https://jira.kiji.org/browse/EXP-428
review: https://review.kiji.org/r/1768
over-the-shoulder-reviewers: ['robertchu']
commit: https://github.com/kijiproject/kiji-express/commit/041e4455ce1d153e100afdcc80a13292543e4b44