Fix hit-test bug when overlay2D child is not overlayed

Fix hit-test bug when overlay2D child is not overlayed

Let's image some case like below scene tree.
root --- A (overlay2D)  --- A1 (normal)
      |- B (normal)

When A1 and B is overlaped, B will be drawn under the A1. (Because A is overlay)
But, in hit-test-algorithm, overlay2D information doesn't propagated.

This patch make hit-test can propagate overlay2D property,
so the hit test result return reasonable as what we can see.

Change-Id: I123d3bbc2c6ba27df3f10829ebaf16b80eb0f987
Signed-off-by: Eunki, Hong <eunkiki.hong@samsung.com>