Fix webmail config

src/freedombone

     if [ ! -f /var/www/webmail/config/config.inc.php ]; then
         # generate the configuration
         echo '<?php' > /var/www/webmail/config/config.inc.php
-        echo "\$config['db_dsnw'] = 'mysql://webmailadmin:${WEBMAIL_ADMIN_PASSWORD}@localhost/webmail';" >> /var/www/webmail/config/config.inc.php
+        echo "\$config['db_dsnw'] = 'mysql://root:${MARIADB_PASSWORD}@localhost/webmail';" >> /var/www/webmail/config/config.inc.php
         echo "\$config['default_host'] = 'localhost';" >> /var/www/webmail/config/config.inc.php
         echo "\$config['support_url'] = '';" >> /var/www/webmail/config/config.inc.php
         WEBMAIL_DES_KEY="$(openssl rand -base64 32 | cut -c1-25)"
         echo "\$config['product_name'] = '${PROJECT_NAME}';" >> /var/www/webmail/config/config.inc.php
         echo "\$config['plugins'] = array('enigma');" >> /var/www/webmail/config/config.inc.php
         echo "\$config['mime_param_folding'] = 0;" >> /var/www/webmail/config/config.inc.php
+        echo "\$config['enable_installer'] = false;" >> /var/www/webmail/config/config.inc.php
     fi
     
     chown -R www-data:www-data $WEBMAIL_PATH