view_update_generator: remove unneeded call to downgrade_to_v1()
view_update_generator: remove unneeded call to downgrade_to_v1()

Signed-off-by: Michael Livshin <ae60993c65de9cdf2ca07b7426c976808535d555@scylladb.com>

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