Fix test_admin_may_nitpick_stuff.
Fix test_admin_may_nitpick_stuff.

Setup user to be an admin so he may nitpick stuff.

Before this commit I saw this failure:

    $ bundle exec ruby -Ilib:test test/exercism/user_test.rb  -n
    test_admin_may_nitpick_stuff
    Run options: -n test_admin_may_nitpick_stuff --seed 42383

    # Running tests:

    F

    Fabulous tests in 0.020076s, 49.8119 tests/s, 49.8119 assertions/s.

      1) Failure:
    UserTest#test_admin_may_nitpick_stuff [test/exercism/user_test.rb:68]:
    Failed assertion, no message given.

    1 tests, 1 assertions, 1 failures, 0 errors, 0 skips

After the change the test passes again:

    $ bundle exec ruby -Ilib:test test/exercism/user_test.rb  -n
    test_admin_may_nitpick_stuff
    Run options: -n test_admin_may_nitpick_stuff --seed 3942

    # Running tests:

    .

    Fabulous tests in 0.019833s, 50.4200 tests/s, 50.4200 assertions/s.

    1 tests, 1 assertions, 0 failures, 0 errors, 0 skips

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