Also additions were needed in include/sfx2/msg.hxx
to avoid build breakage

Found with bin/find-unneeded-includes
Only removal proposals are dealt with here.

Change-Id: I259ff10aaa5d044d4b11f9041174765d5a5f7dc7
Reviewed-on: https://gerrit.libreoffice.org/68364
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>