fix(CardDAV): set owner-principal, displayname properties for SAB

[miaulalala]

Found in #38397

Summary

The SAB has no owner principal even though it is a "shared" address book - the system user shares it will all users automatically.

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[miaulalala]

/backport to stable27

[tcitworld]

1) OCA\DAV\Tests\unit\CardDAV\AddressBookTest::testPropPatchNotShared
Expectation failed for method name is "updateAddressBook" when invoked at least 1 times.
Expected invocation at least 1 times but it occurred 0 time(s).

[backportbot-nextcloud]

The backport to stable27 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable27
git pull origin stable27
# Create the new backport branch
git checkout -b fix/foo-stable27
# Cherry pick the change from the commit sha1 of the change against the default branch# This might cause conflicts. Resolve them.
git cherry-pick abc123
# Push the cherry pick commit to the remote repository and open a pull request
git push origin fix/foo-stable27

More info at https://docs.nextcloud.com/server/latest/developer_manual/getting_started/development_process.html#manual-backport