Allow to disable the Unsafe Browser in the Greeter
The Unsafe Browser can be used by attackers which are able to execute code as amnesia to deanonymize the user by retrieving the public IP address (#15635).
This is a low effort solution to allow users who are concerned about this to protect themselves, without hurting UX for other users.
Feature Branch: bugfix/17085-allow-to-disable-unsafe-browser
- Related to #15635