[M120][WRTjs][VD] Fix app is paused issue when VSS app is launched

[M120][WRTjs][VD] Fix app is paused issue when VSS app is launched

1.InitializeVSS early for hosted app to make sure aul app com connection is created.
2.In custom case, hide VSS is too later, it caused app window is showing before VSS
  video is stopped, then VSS recieve visibility change event and send INTERRUPT event
  to app, so app is paused.
  So hide VSS in HideSplashScreen(Followed M94 logic).

Reference:
https://review.tizen.org/gerrit/#/c/platform/framework/web/chromium-efl/+/303450/

Change-Id: I096dff53987b2b5cdda73d6dfe2c29266f6ac9f7
Signed-off-by: zhaosy <shiyusy.zhao@samsung.com>
(cherry picked from commit 3156f9570c64ed582530c98569c6948d7084d83d)