remove suspend and hibernate button options

[Danielle Foré]

While it is kind of ambiguous about what "sleep" means and it makes sense that you'd want to decide whether that means suspend or hibernate, it seems counterintuitive that we'd want to set buttons to something other than what they say they do.

I don't think it makes a lot of sense for the "suspend" button to do anything other than "suspend" and the "hibernate" button should "hibernate". Of course these keys still exist if someone for some unknown reason really wants to do this.