frontend: refactor passphrase.tsx

Refactor passphrase.tsx to be more concise easier to understand and less
error prone.
- Set passphraseEnabled to decide whether to display the disable or the
  enable wizard.
- When one wizard is rendered it knows the status of the
  passphraseEnabled. Also the disable wizard does not need to know about
  the steps. The enable wizard knows where to start end stop and can
  manage that state on its own.
- SetPassphrase is more explicit and less error prone than toggling it.
- Remove unnecessary API request after receiving a successful response
  after setting the passphrase on the device.
- Remove some code duplication when rendering steps

Author: NicolaLS