Change zbx_tg_tmp_dir in settings

Default value for zbx_tg_tmp_dir in zbxtg_settings.py is set to /tmp/.

Which means that after reboot (commonly) tmp dir will be erased and you will lost all your cached uids (for private and group chats).

It is strongly recommended to create a persistent directory.

I.e. /var/lib/zabbix/zbxtg, and make sure that script has the permissions to write to it.

The result should be: zbx_tg_tmp_dir = "/var/lib/zabbix/" + zbx_tg_prefix