Typo in private user data UI

Change-Id: Ibd6e725ba3aca7662770c21c0d5e7c3cf1c1ebaf
Reviewed-on: https://gerrit.libreoffice.org/6881
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>