Allow expressions (operands) of comparison operators prefixed with the
Logical Operator "Not".

Change-Id: I1b070e2288dac26b1f1186d38cf5d2f4ad99a406
Reviewed-on: https://gerrit.libreoffice.org/71332
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
Reviewed-by: Jens Carl <j.carl43@gmx.de>