loginDialog: Fade in user list after clicking cancel button
We fade in auth prompt after clicking user item in user list, but have no animation after clicking cancel button to return to user list, this commit adds a fading in animation for user list.
This MR also fixes fadeInActor/fadeOutActor
functions in util.js
and uses them, before this MR they are not used and have runtime errors. It also sync GdmUtil.FADE_ANIMATION_TIME
's value with the one actually used in loginDialog.js
.
Fixes #2339.