Force QS squishiness to 1 when fully expanded

There are no scenarios where the shade is fully expanded and QS tiles
should not be their full height. Falling through to the NSSL value
for squishiness can sometimes cause the value to be 0 instead of 1,
which causes flicker and other bad outcomes. We will still pursue
a fix for the incorrect squishiness values coming from NSSL, but this
change will eliminate most flicker and significantly mitigate any
other potential symptoms, e.g. b/407098346

Test: manual
Flag: EXEMPT single CL bug fix
Fixes: 406617116
Change-Id: Ic78ced074cc064b099f5ce2794989538133edf3f