fix: update file name for biome ID configuration file

Author: smartcmd

server/src/main/java/org/allaymc/server/world/biome/CustomBiomeIdAllocator.java

@@ -21,7 +21,7 @@
 public final class CustomBiomeIdAllocator {
 
     private static final int CUSTOM_BIOME_ID_START = 30000;
-    private static final String FILE_NAME = "biome_ids.yml";
+    private static final String FILE_NAME = "biome-ids.yml";
 
     private static CustomBiomeIdAllocator instance;