[admin] fix bug with hold_ground
[admin] fix bug with hold_ground

The original code caused useless JOIN messages to be sent to the server whenever someone is kicked.
Also, fix bug from commit ebeda452e88306e3e058506930f97eadfd7a7dc9 caused kick trigger an error when the [admin] section of the config file is missing

Uname-a/knife_scraper,Uname-a/knife_scraper,Uname-a/knife_scraper