Honoring root's view mode when opening new window.

We previously used to honor the view mode configuration when we
change/select the root. However, opening in new window goes through a
different code path, and skips the openRoot code. This fixes it by
always loading the root's view mode at every directory opening.

Bug: 38230161
Change-Id: I551bc7000abe555f95364eaaeac43df578c5bf1b