Fix TaskView usage in DetailsDialog

We've done some changes to how we deal with the TaskView in
PanelTaskViewController to address issues with the Home Panel. This CL
migrates those changes to DetailsDialog, which to improves TaskView behaviour and fixes the issue.

Test: manual: open Device Controls, tap on a camera control, long tap outside of
the TaskView.
Test: atest DetailDialogTest
Fixes: 282144424

Change-Id: If583934773a6a8e728475aa0eb4a0b54563a89e3