This took a while to find so I'll post it here so anyone who wants to know can do it. All you have to do is add
cl_join_advertise 2
to your autoexec.cfg file in your games cfg folder.
The file may not have been created in your cfg folder already, you can usually find it at the following location :
C:\Program Files (x86)\steam\steamapps\common\Counter-Strike Global Offensive\csgo\cfg
cl_join_advertise 2
to your autoexec.cfg file in your games cfg folder.
The file may not have been created in your cfg folder already, you can usually find it at the following location :
C:\Program Files (x86)\steam\steamapps\common\Counter-Strike Global Offensive\csgo\cfg