Resolves: fdo#87141 Remove deletes the node, release doesn't

regression from introduction of boost::ptr_vector originally one had to Remove
and delete the return to delete it, while now the Remove automatically delete
it. This bare Remove to just "release" it seems to have been overlooked

Change-Id: I175f7c95862ce47402993e5e3b8feaa93af43e75
(cherry picked from commit efcbb12a27a380a442292f17c7f508555a66d4af)
(cherry picked from commit a27bb66382687ce348db5f57a1e64ee6afcb5c43)
Reviewed-on: https://gerrit.libreoffice.org/13423
Reviewed-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Reviewed-by: Jan Holesovsky <kendy@collabora.com>
Tested-by: Jan Holesovsky <kendy@collabora.com>