Fix bug with portrait-fold devices animating app pairs launch wrongly

This CL makes it so that isLeftRightSplit is correctly called instead of isLandscape when animating an app pair launch.

Fixes: 318756992
Test: Manual
Flag: ACONFIG com.android.wm.shell.enable_app_pairs TEAMFOOD
Change-Id: Id766a3f9bd315abc277e36a118fd233156cf3898

quickstep/src/com/android/quickstep/views/FloatingAppPairBackground.kt

@@ -115,7 +115,7 @@ class FloatingAppPairBackground(
     }
 
     override fun draw(canvas: Canvas) {
-        if (launcher.deviceProfile.isLandscape) {
+        if (launcher.deviceProfile.isLeftRightSplit) {
             drawLeftRightSplit(canvas)
         } else {
             drawTopBottomSplit(canvas)