Reset TaskView transformations on orientationHandler change

* Transformations in the old orientation handler
(ex. translate X for portrait) aren't reset when
device changes to fake landscape (starts modifying translate Y).
The new translations are picked up correctly, this resets the
old ones.

Test: Bug no longer repros.
Rotated device while scrolling through tasks, no change in
behavior from before.
Can't think of other instances where tasks are in motion
and orientation handler can change.
Fixes: 233316942

Change-Id: Ie07340e69a2c93b71b1dabb8029c96ad05a4d4a1