Client delete doesn't delete/drop the client's databases

Summary

When you delete a client and all his data, the databases doesn't get deleted and dropped.

Steps to reproduce

1. Create a client
2. Create a web site
3. Create a database for the web site and an user for the database
4. Delete the client confirming to delete all his data.

Correct behaviour

All resources of the client should be deleted including the databases.

Environment

Server OS + version: (Debian 10)
ISPConfig version: 3.2.8p1

Software version of the related software:

Server version: Apache/2.4.53 (Debian)
Server built:   2022-03-14T16:28:35

PHP 7.4.30 (cli) (built: Jun 14 2022 10:31:12) ( NTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies
    with SourceGuardian v13.0.0, Copyright (c) 2000-2022, by SourceGuardian Ltd.
    with Zend OPcache v7.4.30, Copyright (c), by Zend Technologies

Proposed fix

If file interface/web/client/client_del.php add web_database in the $tables array