fix(sound): correct mappedBy reference in SoundEventEntity to properly link sound file sources

Author: theEvilReaper

src/main/java/net/onelitefeather/vulpes/api/model/sound/SoundEventEntity.java

@@ -44,7 +44,7 @@ public class SoundEventEntity implements VulpesModel {
      * Represents the list of sound data related to this sound model.
      * This is a one-to-many relationship where each sound model can have multiple sound data entities.
      */
-    @OneToMany(mappedBy = "id")
+    @OneToMany(mappedBy = "soundEvent")
     private List<SoundFileSource> dataEntities;
 
     /**