fix(cli): distinguish between subjectSet and subjectID in check command

attempt of fixing #850 but the command:

./keto check 'videos:/cats/1.mp4#owner' view videos '/cats/1.mp4' still Outputs "Denied" even though it should be "Allowed" because of:

NAMESPACE       OBJECT          RELATION NAME   SUBJECT
videos          /cats/1.mp4     view            videos:/cats/1.mp4#owner

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Hi, and thanks for your contribution! It looks quite solid already, but could you add some tests to see that it actually works? Thanks!

Hi, and thanks for your contribution! It looks quite solid already, but could you add some tests to see that it actually works? Thanks!

Hi, Yes I'll do :)