types: fix uuid_type_impl::less
types: fix uuid_type_impl::less

timeuuid_type_impl::compare_bytes is a "trichotomic" comparator (-1,
0, 1) while less() is a "less" comparator (false, true). The code
incorrectly returns c1 instead of c1 < 0 which breaks the ordering.

Fixes #1196.
Message-Id: <9f6fe8136478864f32231d484cc708acf91c937d@scylladb.com>

avikivity/scylla,avikivity/scylla,scylladb/scylla,scylladb/scylla,duarten/scylla,scylladb/scylla,raphaelsc/scylla,raphaelsc/scylla,duarten/scylla,scylladb/scylla,duarten/scylla,avikivity/scylla,raphaelsc/scylla