Fix for TOTP codes not updating when the views disappeared

[jdmoreira]

Motivation

There was a bug where when the SwiftUI View disappeared from the view hierarchy we would destroy the timer and invalidate the account. On long lists of TOTP codes this was a problem since each view will disappear from the view hierarchy when the user scrolls up and down.

Changes

• Use a single static timer for all updates since we only need to trigger once per seconds independently of each individual TOPT
• Improve the animation for the pie indicator since when the view re-entered the view hierarchy it would interpolate more then 1s and it would look strange

[AdamVe]

Fixes the issue, tested on device.