HIG fixes for svtools

Change-Id: I8b874ed49e50b7ea15774ca3b0cd9a963898fc94
Reviewed-on: https://gerrit.libreoffice.org/13049
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>