(fix) Update workspace item hide logic

* Previously, launcher.getHotseat does not seem to work
  in all scenarios, so let's use workspace.getHotseat()

* Apart from this, duration for hotseat does not seem to
  work when set to 0, so set it to 50 as default, and 0
  specific to pageIndicator.

Signed-off-by: Saalim Quadri <danascape@gmail.com>