py3: add test-contrib-emacs.t to passing tests list
I installed emacs on the server running buildbot and the test started passing on
Python 3. Lets add it to the list of passing test.
Differential Revision: https://phab.mercurial-scm.org/D6500
wrap 0: [0, 'orig']
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wrap 0: [0, 4, 3, 2, 1, 0, 'orig']
unwrap 3: 3: [0, 4, 2, 1, 0, 'orig']
unwrap -: 0: [4, 2, 1, 0, 'orig']
unwrap 0: 0: [4, 2, 1, 'orig']
unwrap 4: 4: [2, 1, 'orig']
unwrap 0: -: ValueError
unwrap 2: 2: [1, 'orig']
unwrap 1: 1: ['orig']
unwrap -: -: IndexError
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