Fix gear not showing when rotation or RTL changed

When rotation or RTL changed, gear button's translationX should be
updated to new position.

Test: (Rotation) Swipe notification to left > Gear is showing on the
right > Rotate the device > Gear button should be visible
Test: (RTL) Swipe notification to left > Set RTL language
> Swipe notification to right in RTL configuration
> Gear button should be visible

Change-Id: I04a657d380b746b30585ff8159b7a9b4865f423a