tests: mutation_reader_assertions: Simplify
tests: mutation_reader_assertions: Simplify

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