Clean up syntax of params to "build" calls.

RefactorCop says there are 8 problems with `people_controller.rb`.  This PR takes care of the 6 more serious concerns -- methods are called with odd syntax, including a space between the method name and `(`.

c.f. http://www.refactorcop.com/kgf/lims?page=1&severity=warning
c.f. https://github.com/kgf/lims/blob/master/app/controllers/people_controller.rb#L90

@kgf