refactor: remove unnecessary configs in wurmserver config

The commit removes unused lines in the wurmserver configuration file. The removed lines include servercfgdir, servercfg, servercfgdefault, and servercfgfullpath. These lines are no longer needed and have been removed to clean up the code.

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

@@ -25,7 +25,6 @@ gamemode="Creative"
 #  4 - Freedom
 homekingdom="4"
 
-
 # Unlocks the admin commands from within the game, that can be used to change
 # the gameplay settings of the server, such as skill gain rate and field growth time.
 adminpassword="ADMINPASSWORD"
@@ -202,10 +201,6 @@ glibc="2.14"
 systemdir="${serverfiles}"
 executabledir="${systemdir}"
 executable="./WurmServerLauncher"
-servercfgdir="${systemdir}"
-servercfg="${selfname}.cfg"
-servercfgdefault="server.cfg"
-servercfgfullpath="${servercfgdir}/${servercfg}"
 
 ## Backup Directory
 backupdir="${lgsmdir}/backup"