Bug 1089451 - Swiping down from top edge when utility tray is already op...

...en and it closes; quite opposite from gesture's movement
this looks suspicious :) that we need to wait after the `release`.
maybe we just need to `waitForOpened` between the 2 `swipeDown` calls in `Swiping down when already opened`

on a related note, we might want to add a `waitForOpened` in the UtilityTray helper :)