Databases still exists on reseller delete

short description

Reseller-Databases still exists in ISPConfig if a reseller will deleted. (Only assigned site will removed)

correct behaviour

If a reseller is deleted the databases should removed too.

environment

Server OS: (debian)
Server OS version: (stretch) ISPConfig version: (3.1.13 stable)

Server version: Apache/2.4.25 (Debian) Server built: 2018-06-02T08:01:13

PHP 7.2.11-2+020181015120801.9+stretch1.gbp8105e0 (cli) (built: Oct 15 2018 12:08:03) ( NTS ) Copyright (c) 1997-2018 The PHP Group Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies with Zend OPcache v7.2.11-2+020181015120801.9+stretch1.gbp8105e0, Copyright (c) 1999-2018, by Zend Technologies