Added onClick logic for domain url list screen

This class was created from a code refactoring
in ManageApplications but the functionality
associated with clicking on a preference was
accidently left out. This CL restores that
functionality.

Test: run ManageDomainUrlsEspressoTest class
Bug: 31958776
Change-Id: I1a7f5ee92daeebdb9fd7d9c83a564f0d104aa562