Scrolling: Fix fade in workspaces from ignoring us

The fade in option ignores all user settings if
the device is in landscape or is a tablet. Clean up
the settings loading logic and ensure that the user
settings are respected always.

Repro Steps:
- Force Rotation
- kill trebuchet
- scroll to new screen

Change-Id: I9bc49d1abebd88ac8c95ef44ea4e874494e29e1e
(cherry picked from commit 8de4b987)
(cherry picked from commit 2788ceba)