refactor: rename bossItemMerchantNPC class

Author: darksaid98

src/main/java/me/ShermansWorld/AlathraExtras/npcs/BossItemMerchantNPC.java

@@ -12,7 +12,7 @@
 /**
  * Handles code for the boss item merchant, specifically the one for the nether update.
  */
-public class bossItemMerchantNPC{
+public class BossItemMerchantNPC {
     public static final int ID = 83;
 
     /**

src/main/java/me/ShermansWorld/AlathraExtras/npcs/NPCListener.java

@@ -8,8 +8,8 @@
 public class NPCListener implements Listener {
     @EventHandler
     public void npcSpawnListener(NPCSpawnEvent e) {
-        if (e.getNPC().getId() == bossItemMerchantNPC.ID){
-            bossItemMerchantNPC.teleportMerchant();
+        if (e.getNPC().getId() == BossItemMerchantNPC.ID){
+            BossItemMerchantNPC.teleportMerchant();
         }
     }
 }