Split shade: fix QS/Media briefly showing on AOD when locking the screen

When we lock the screen, QS are hidden by being moved up by the height of
the QS header. This works on portrait, but on split shade QS uses the
entire height of the screen, so this movement amount has to be adjusted.

Fixes: 223770585
Test: Unit tests + Manually
Change-Id: Ie82d75cc677da3567790887eab096d86afd6abd5