repair/row_level: mutation_fragment_v1_stream() instead of downgrade_to_v1()
repair/row_level: mutation_fragment_v1_stream() instead of downgrade_to_v1()

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

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