Activate User key encryption from the Admin / Settings page

[jcassette]

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Is your feature request related to a problem? Please describe.
User key encryption needs to be explicitly activated by calling ./occ encryption:disable-master-key.
https://docs.nextcloud.com/server/25/admin_manual/configuration_files/encryption_details.html#key-type-user-key

Describe the solution you'd like
User key encryption can be activated from the Admin / Settings page
For example in the Server-side encryption section:
https://docs.nextcloud.com/server/25/admin_manual/configuration_files/encryption_configuration.html#enabling-encryption

Describe alternatives you've considered
None

Additional context
Some hosting providers do not provide access to the command line, making it impossible to enable User key encryption