Update dark mode in accessiblity settings

There was an entry point to dark mode that wasn't updated when the
display settings one was changed to point to a new screen. This
change makes it so that clicking dark mode in accessiblity also
opens the same screen.

Test: robotests pass
Bug: 129406772
Change-Id: I0ad830638e04e5520cdf7de6927764fa6b68a179