Convert RID_XMLSECDLG_MACROWARN to .ui

Change-Id: Icc364804bfe2e6ee05f73c7c0152acbcf7f6fefd
Reviewed-on: https://gerrit.libreoffice.org/9798
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>