lsa: Fix compact_and_evict() being called with a too low step
lsa: Fix compact_and_evict() being called with a too low step

compact_and_evict gets memory_to_release in bytes while
reclamation step is in segments.

Broken in f092decd90df1daba5af00ca8c3d8b45b457dbae.

It doesn't make much difference with the current default step of 1
segment since we cannot reclaim less than that, so shouldn't cause
problems in practice.

Message-Id: <2328ee4edcbfd2b897ccb8f85e9d1ec524b717ee@scylladb.com>

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