Rename config file in KeyStorage constructor

Changed the configuration file from "messages.yml" to "key_storage.yml". This update fixes a bug where it was writing to the wrong file.

src/main/java/com/alttd/playerutils/config/KeyStorage.java

@@ -20,7 +20,7 @@ public class KeyStorage extends AbstractConfig {
                          + "mnt" + File.separator
                          + "configs" + File.separator
                          + "PlayerUtils"),
-                "messages.yml", logger);
+                "key_storage.yml", logger);
         this.logger = logger;
     }