Initialize fixedToViewport flags to false when synchronizing the compositing layers.

Initialize fixedToViewport flags to false when synchronizing the compositing layers.

[Title] Initialize fixedToViewport flags to false when synchronizing the compositing layers.
[Issue#] N_SE-51581, N_SE-52068
[Problem] A element has fixed location after exiting fullscreen.
[Cause] After exiting fullscreen, the position:fixed property of element was removed,
        but the GraphicsLayer still has fixedToViewport flag.
[Solution] Initialize fixedToViewport flags to false when synchronizing the compositing layers.

Change-Id: Ie1a4100932fc90c9fb2eb7701e67fdee29402002