RoutePointerUpEvent in SlateApplication doesn't check if a drag is occurring for touch events

When SlateApplication is routing a pointer up event, it should check bIsDragDropping and call the widget's OnDrop function. Currently, we check for touch events and call OnTouchEnded without checking if we're dragging.

1. Create a widget that implements NativeOnDrop
2. Create a widget that implements NativeOnMouseButtonDown and NativeOnDragDetected.
3. Using a touch device, drag your draggable widget onto your drop zone widget
4. OnDrop will not be called

[UE-23848] Bug Status

Fix UE-51650

i have this problem UE4CC-Windows-58DC12AF4B97F057BD108FBFF569B2E9_0000

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