MDEV-24171 index_online_log is instrumented as rw-lock, not mutex

The row_log_t::mutex is a mutex, yet it was instrumented as
rw-lock in PERFORMANCE_SCHEMA.

Author: dr-m

storage/innobase/handler/ha_innodb.cc

@@ -614,6 +614,7 @@ static PSI_mutex_info all_innodb_mutexes[] = {
 	PSI_KEY(ibuf_bitmap_mutex),
 	PSI_KEY(ibuf_mutex),
 	PSI_KEY(ibuf_pessimistic_insert_mutex),
+	PSI_KEY(index_online_log),
 	PSI_KEY(log_sys_mutex),
 	PSI_KEY(log_sys_write_mutex),
 	PSI_KEY(mutex_list_mutex),
@@ -671,7 +672,6 @@ static PSI_rwlock_info all_innodb_rwlocks[] = {
 	PSI_RWLOCK_KEY(trx_i_s_cache_lock),
 	PSI_RWLOCK_KEY(trx_purge_latch),
 	PSI_RWLOCK_KEY(index_tree_rw_lock),
-	PSI_RWLOCK_KEY(index_online_log),
 	PSI_RWLOCK_KEY(hash_table_locks)
 };
 # endif /* UNIV_PFS_RWLOCK */