Refactored hotseat translation X logic

Made retrieval of the hotseat translation X easier to use.

Test: Manual. Set the navigation mode to 3-button. Moved the bubble bar
from one side to the other. Switched the navigation mode to gestures.
Moved the bubble bar from one side to the other again.
Bug: 373422448
Flag: EXEMPT refactoring

Change-Id: Ie69f1ecf178244008e5c752882c4b91a30928756