Adjust config for new fight system

Signed-off-by: Lixfel <agga-games@gmx.de>

src/de/steamwar/bungeecore/ArenaMode.java

@@ -71,7 +71,6 @@ public class ArenaMode {
         return allModes;
     }
 
-    private final String internalName;
     private final String displayName;
     private final String folder;
     private final List<String> chatNames;
@@ -83,7 +82,6 @@ public class ArenaMode {
     private final String schemType;
 
     private ArenaMode(String internalName, Configuration config){
-        this.internalName = internalName;
         this.folder = config.getString("folder");
         this.serverJar = config.getString("serverJar");
         this.maps = config.getStringList("maps");