feat(arkserver): add altsavedirectoryname to allow custom save location (#2948)

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

@@ -15,11 +15,12 @@ queryport="27015"
 rconport="27020"
 # Default Map: TheIsland, Ragnarok, CrystalIsles, Aberration_P, ScorchedEarth_P
 defaultmap="TheIsland"
+altsavedirectoryname="${defaultmap}"
 maxplayers="70"
 
 ## Server Start Command | https://docs.linuxgsm.com/configuration/start-parameters#additional-parameters
 fn_parms(){
-parms="${defaultmap}?AltSaveDirectoryName=${defaultmap}?listen?MultiHome=${ip}?MaxPlayers=${maxplayers}?QueryPort=${queryport}?RCONPort=${rconport}?Port=${port} -automanagedmods -crossplay -PublicIPForEpic=${ip}"
+parms="${defaultmap}?AltSaveDirectoryName=${altsavedirectoryname}?listen?MultiHome=${ip}?MaxPlayers=${maxplayers}?QueryPort=${queryport}?RCONPort=${rconport}?Port=${port} -automanagedmods -crossplay -PublicIPForEpic=${ip}"
 }
 
 #### LinuxGSM Settings ####