fdo#75757: remove inheritance to std::vector

from TEParaPortions (through ToolsList, close to be deleted ;).

Change-Id: Iec92ebb54ebc44d94ccc8cb30230ffb44b937b35
Reviewed-on: https://gerrit.libreoffice.org/11954
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>