Fix issues with deletion of individual jobs from failure queue

- The wrong params was being pulled so the call to Resque::Failure.remove
was essentially Resque::Failure.remove(nil). Changed to use params[:id]
instead of params[:index]
- After job is removed,  controller redirected to
FailuresController#show. This view is broken and seems to be redundent
(or possibly needs refactoring). The FailuresController#index view
provides the same view FailuresController#show does if you pass the
:queue param