Fix small typo in users_controller_test.rb
Fix small typo in users_controller_test.rb

A small typo that did not affect the result
of the test, but rendered it ineffective was
found in users_controller_test.rb.  This
commit fixes it.

Signed-off-by: Jason Dossett <e6f895edd39634df23774f0615e338f58a73f02c@utdallas.edu>

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