remove usages of TerraWorld#getConfig

common/addons/config-biome/src/main/java/com/dfsek/terra/addons/biome/command/biome/arg/BiomeArgumentParser.java

@@ -14,6 +14,6 @@ public class BiomeArgumentParser implements ArgumentParser<TerraBiome> {
     @Override
     public TerraBiome parse(CommandSender sender, String arg) {
         Player player = (Player) sender;
-        return main.getWorld(player.world()).getConfig().getRegistry(TerraBiome.class).get(arg);
+        return player.world().getConfig().getRegistry(TerraBiome.class).get(arg);
     }
 }

common/addons/config-biome/src/main/java/com/dfsek/terra/addons/biome/command/biome/tab/BiomeTabCompleter.java

@@ -17,6 +17,6 @@ public class BiomeTabCompleter implements TabCompleter {
     @Override
     public List<String> complete(CommandSender sender) {
         Player player = (Player) sender;
-        return main.getWorld(player.world()).getConfig().getRegistry(TerraBiome.class).entries().stream().map(TerraBiome::getID).collect(Collectors.toList());
+        return player.world().getConfig().getRegistry(TerraBiome.class).entries().stream().map(TerraBiome::getID).collect(Collectors.toList());
     }
 }