Payment workflow does not retain currency unit state

[luisschwab]

When making a payment, the workflow does not retain state about the selected currency unit.

For example: On the main screen, I select to pay 10 USD. In the confirm payment screen, I am promped to make a payment of 10 sats.

It should retain the selected unit.

Main screen (USD):

Confirm payment screen (sats):

version: 0.9.0 OS: android