Fix clipping of QS tiles in large screen portrait shade

Changed the clipping bounds in large screen portrait to qs container padding + qs container margin. Also fixed qs_tiles_page_horizontal_margin so that it's the half of the clipping margin.

Fixes: 228970271
Test: Manual
Change-Id: Ia03e717d7fbc6665c56eef0c1d6cb3f681ad5790
3 files changed