Prevent users/group from making public links with write/delete permissions.

[Kosygor]

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Hello.
I have made group that have read-only permissions and permission to make public links. Still they can choose to make public link with write access. Delete option is not there but users with public link can "change filename".

Describe the solution you'd like
List of available permissions for public links should be inherited from permissions from user that made them.

[kesselb]

cc @nextcloud/security