fix(pz): pass the admin password as a start parameter (#4991)

Project Zomboid prompts for an admin password on first start when none is
given, and the server waits there forever because LinuxGSM runs it in
tmux (and Docker has no terminal at all).

lgsm/config-default/config-lgsm/pzserver/_default.cfg

@@ -13,7 +13,7 @@ ip="0.0.0.0"
 adminpassword="CHANGE_ME"
 
 ## Server Parameters | https://docs.linuxgsm.com/configuration/start-parameters#additional-parameters
-startparameters="-servername ${selfname}"
+startparameters="-servername ${selfname} -adminpassword ${adminpassword}"
 
 #### LinuxGSM Settings ####