Controls Task View - Limit screen width

For larger displays in landscape mode, the task view should appear on
the right side of the display and take up just under half the width,
with a dark scrim covering the rest of display. Also adjust the insets
for this new layout.

Fixes: 216105163
Test: manual - Tablets and phones in both portrait and landscape
Change-Id: Ib0b123b2002cbe3947a9c3782e479700d1689d1a