Fix SystemUI not using appropriate horizontal settings on devices

This is a correction to I6e1a61b9280ed566b2348ecf06c47b789d1e0e3c
which meant to fix tablet's horizontal settings but ruin it for
other devices.

Modern phones, specifically phablets, are now having more than
800dp screen width on landscape so please use screen height
instead.

Change-Id: I2d09c6776f96efb4ccb98a40b839eb684d3e1c9f