Don't use a scrollable dialog for CastDialog

Cast dialog needs to display a ListView that may be scrollable. ListView
does not play well inside a NestedScrollView. As a low risk solution,
special case the style for this dialog to not use NestedScrollView.

Test: manual
Fixes: 230517187
Change-Id: I29eb27050c39915ee16f81b83abb8dae781f9588