Fix build on new spigot versions

Villager.Profession was moved to a registry, only breaks at compile time.

Essentials/src/main/java/com/earth2me/essentials/MobCompat.java

@@ -296,7 +296,7 @@ public enum VillagerProfession {
         }
 
         private Villager.Profession asEnum() {
-            return EnumUtil.valueOf(Villager.Profession.class, newProfession, oldProfession);
+            return RegistryUtil.valueOf(Villager.Profession.class, newProfession, oldProfession);
         }
     }