tests: Read after write in test_write_counter_table.
tests: Read after write in test_write_counter_table.

This covers the case of deleted counter cells.

Signed-off-by: Vladimir Krivopalov <dc9186a06078733915a6fcbab34e59120be2b484@scylladb.com>

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