Fix decorator cursor size didn't changed issue

Fix decorator cursor size didn't changed issue

Since dali don't change the size during Relayout callback working,
the cursor size was not applied at 'current' relayout result.

So there was some issue that the cursor size applied well after 1 event loop working.

To avoid this issue, let we 'add' some relayout required actor to container.
It will call Relayout internally, at this loop.

TODO : Is there any other actor to be changed during relayout?

Change-Id: I88f48c7b64e76644ea8738abce4245a584c83cc9
Signed-off-by: Eunki, Hong <eunkiki.hong@samsung.com>