The member is initialized to false in the ctor
and that value is never changed afterwards.
Drop it altogether and simplify code accordingly.
Change-Id: I0213e9f74b353a214af3ad163a934bfa7e868412
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/211913
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>
Tested-by: Jenkins