Fix 2 finger pull down animation

In order to animate smoothly when going directly to QS, and skipping
QQS, we need to propagate the squishiness amount to the paged tile
layout.

Test: pull down shade, on split screen, landscape, portrait
Test: pull down QS, scroll through pages
Test: pull down shade with 2 fingers
Test: atest QSSquishinessControllerTest
Fixes: 204916761
Change-Id: I249e49a7b6c6ce1e9b6da28ab80ead771b962edc