Making sure collapseOrExpandedQs doesn't do anything in split shade

This is actually never called in split shade anymore - it was only used by accessibility action in QS which was removed for split shade in ag/21447326.
This extra check is to prevent the regression happening in the future.

Bug: 269462512
Test: presubmit
Change-Id: Ib1472531c12aa667530f0c4cc407b22a798d7203