Keep nav button container and back button stable during SUW

- Disable translations on both the container and back button while
  in SUW since it's aligned with SUW actions (even in the rare case
  that a user will set up device lock and then lock/unlock the screen
  to show the bouncer while in SUW)

Bug: 346923810
Flag: EXEMPT bugfix
Test: Wipe and go through SUW with device lock
Change-Id: I2d500103e8775d8cf52185d43b3b43cc518884e1