clicking app's home button does not clear fields

Description

Clicking the "Check out" icon in the navigation button does not reset the app to its default state

Expected results

The app would reset to its default state, i.e. all fields should be cleared.

Actual results

Nothin'.

Steps to reproduce

• Click the Checkout app icon in the main nav
• Type something into a field. Any field.
• Click the Checkout app icon in the main nav. All fields should be cleared but they aren't.