If you had data in the outline and would scroll to the bottom then it would be
an empty view at the bottom. The width of the outline was defined as a fixed
with twice. Once in the outlnvsh and one (even smaller) in the outlview. I have
changed the with of the outlview to take the with of the outlnvsh.

Change-Id: I1376a135acd92dbe8966b29ccb075e6b74412a8c
Reviewed-on: https://gerrit.libreoffice.org/7832Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>