commitlog: Recycle or not should not depend on shutdown state

If we are using recycling, we should always use recycle in
delete_segments, otherwise we can cause deadlock with replenish
task, since it will be waiting for segment, then shutdown is set,
and we are called, and can't fulfil the alloc -> deadlock

db/commitlog/commitlog.cc

@@ -1802,7 +1802,7 @@ future<> db::commitlog::segment_manager::delete_segments(std::vector<sstring> fi
             }
 
             // We allow reuse of the segment if the current disk size is less than shard max.
-            if (!_shutdown && cfg.reuse_segments) {
+            if (cfg.reuse_segments) {
                 auto usage = totals.total_size_on_disk;
                 auto recycle = usage <= max_disk_size;