Fix touch fails after drag and drop

The drag surface would reparent to null in the end of drag & drop.
But the deatched layer didn't dirty the input cause InputFlinger
would not receive the latest input windows.

- Dirty input when remove layer from current state.

Bug: 151171041
Test: atest DragDropTest CrossAppDragAndDropTests
Change-Id: I3cf9b063801260f276eb20b3aa474b4b3e692cfb
diff --git a/services/surfaceflinger/Layer.cpp b/services/surfaceflinger/Layer.cpp
index 3765d0d..1b9246e 100644
--- a/services/surfaceflinger/Layer.cpp
+++ b/services/surfaceflinger/Layer.cpp
@@ -219,6 +219,9 @@
     }
 
     mFlinger->markLayerPendingRemovalLocked(this);
+    if (hasInput()) {
+        mFlinger->dirtyInput();
+    }
 }
 
 void Layer::onRemovedFromCurrentState() {