cmbarton: resized icons for gronsole to standard 24x24, made a more
understandable icons for expanding/hiding output.
(merge from devbr6, https://trac.osgeo.org/grass/changeset/35026)


git-svn-id: https://svn.osgeo.org/grass/grass/trunk@35054 15284696-431f-4ddb-bdfa-cd5b030d7da7