Add a "Restart now" button to persistence setup assistant
_Originally created by Tails on [#5881 (Redmine)](https://public-redmine-archive.tails.boum.org/code/issues/5881)_
Add a “Restart now” button to the dialog of the persistence wizard that
states that you need to reboot to apply the changes.
### Related issues
- **Related to** tails/tails#15572
- **Related to** tails/tails#14544
- **Has duplicate** tails/tails#14715
- **Is duplicate of** tails/tails#16384
- **Blocks** tails/tails#11529
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