[ci skip] Merge pull request #5895 from joshkel/pdo-db-close
[ci skip] Merge pull request #5895 from joshkel/pdo-db-close

Fix database connection leak when closing PDO connection
madwings/InsaneDB,butane/CodeIgniter,butane/CodeIgniter,madwings/InsaneDB,bcit-ci/CodeIgniter,butane/CodeIgniter,madwings/InsaneDB,butane/CodeIgniter,bcit-ci/CodeIgniter,bcit-ci/CodeIgniter,bcit-ci/CodeIgniter,madwings/InsaneDB,madwings/InsaneDB,bcit-ci/CodeIgniter,butane/CodeIgniter