Accessing INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION may break innodb_open_files logic

If the function i_s_tablespaces_encryption_fill_table() was not able to report all content to the SQL layer, it would fail to decrement fil_system.freeze_space_list that it had incremented. This would prevent the not-frequently-used logic from working, potentially causing frequently used files to be closed and reopened whenever innodb_open_files is exceeded.

This regression was caused by MDEV-23855, which removed the fil_system.LRU list and introduced the not-frequently-used logic for closing and opening InnoDB data files.