Instead of fighting with this obsolete thing, let's
just kill it. This fixes disabling in read-only doc,
as well as pressed/unpressed states.

Change-Id: I4d06ba3395024ffd09d77c6d22653a2c5e227115
Reviewed-on: https://gerrit.libreoffice.org/22010Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Maxim Monastirsky <momonasmon@gmail.com>