tests: get rid of sstable::make_reader_v1() in broken_sstable_test
tests: get rid of sstable::make_reader_v1() in broken_sstable_test

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

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