Split shade: fix lockscreen drag down happening on the wrong side

The issue was caused by the horizontal offset of the notifications
container on split shade being "counted" twice.

On handheld this was a non-issue, since the offset is non existent.

Fixes: 264575009
Test: Manually on device. See video.
Change-Id: I04eed5f608bf6f8c65f8a22385e655315ff85f23

packages/SystemUI/src/com/android/systemui/statusbar/LockscreenShadeTransitionController.kt

@@ -262,7 +262,6 @@ class LockscreenShadeTransitionController @Inject constructor(
 
     fun setStackScroller(nsslController: NotificationStackScrollLayoutController) {
         this.nsslController = nsslController
-        touchHelper.host = nsslController.view
         touchHelper.expandCallback = nsslController.expandHelperCallback
     }
 
@@ -736,14 +735,12 @@ class DragDownHelper(
 
     private var dragDownAmountOnStart = 0.0f
     lateinit var expandCallback: ExpandHelper.Callback
-    lateinit var host: View
 
     private var minDragDistance = 0
     private var initialTouchX = 0f
     private var initialTouchY = 0f
     private var touchSlop = 0f
     private var slopMultiplier = 0f
-    private val temp2 = IntArray(2)
     private var draggedFarEnough = false
     private var startingChild: ExpandableView? = null
     private var lastHeight = 0f
@@ -923,7 +920,6 @@ class DragDownHelper(
     }
 
     private fun findView(x: Float, y: Float): ExpandableView? {
-        host.getLocationOnScreen(temp2)
-        return expandCallback.getChildAtRawPosition(x + temp2[0], y + temp2[1])
+        return expandCallback.getChildAtRawPosition(x, y)
     }
 }