ring_position_exponential_sharder: stop calling global_partitioner()
ring_position_exponential_sharder: stop calling global_partitioner()

ring_position_exponential_sharder calls global_partitioner
in one constructor. Luckily the constructor is never used so
we can remove that constructor.

Signed-off-by: Piotr Jastrzebski <2c0eb4a25a7cde333ff2d0860cb06051925fd74f@scylladb.com>

scylladb/scylla,scylladb/scylla,avikivity/scylla,avikivity/scylla,avikivity/scylla,scylladb/scylla,scylladb/scylla