Reindent outdev.hxx - minor formatting change

Change-Id: I5095728ca486b6a609d26520ff45f8bc5bde1c21
Reviewed-on: https://gerrit.libreoffice.org/7888
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>