sstables: Use manager's config() in .new_sstable_component_file()
sstables: Use manager's config() in .new_sstable_component_file()

This is the last place left that calls for global get_config(),
switch it onto _sst_manager.config().

Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@scylladb.com>

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