Make hole match with Actor size at color visual shader

Make hole match with Actor size at color visual shader

There was some needs that ignore the contents area when we use Shadow.

Since visual itself doesn't know the area of view, we should use
just uSize and visual itself's corner radius.

Change-Id: I1ae6104c9d8260f43230d2949af45c8b244419f6
Signed-off-by: Eunki, Hong <eunkiki.hong@samsung.com>