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

packages/SystemUI/src/com/android/systemui/shade/QuickSettingsController.java

@@ -1377,6 +1377,9 @@ public class QuickSettingsController {
     }
 
     private void collapseOrExpandQs() {
+        if (mSplitShadeEnabled) {
+            return; // QS is always expanded in split shade
+        }
         onExpansionStarted();
         if (getExpanded()) {
             flingQs(0, FLING_COLLAPSE, null, true);