fdo#75757: remove inheritance to std::vector

from SwRedlineSaveDatas

Change-Id: Ie178983496891c8bd964b37536058d2e6b310c29
Reviewed-on: https://gerrit.libreoffice.org/11947
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>