Updating installation does not prompt for fallback xahaud server or affordable extra fee

[effofexx]

Updating hosts from v0.8.1 to v0.8.2 does not prompt users for fallback xahaud server or affordable extra fee, and the mb-xrpl.cfg file remains in the same format as it was for v0.8.1.

Users updating to the newest version will not be able to make use of the new features without manually modifying the mb-xrpl.cfg file or executing evernode config extrafee and evernode config xahaud-fallback, which is not clear based on the console output while updating.

Recommend prompting users for this information during the update process, or displaying a message telling them to execute those commands upon completion of the update.