Use dedicated slot constant for public kit loading

- Add `LOAD_PUBLIC_KIT_SLOT` in layout constants
- Wire LOAD KIT button and handler to the new slot constant in `GUI`

Author: rossnoah

src/main/java/dev/noah/perplayerkit/gui/GUI.java

@@ -326,10 +326,10 @@ public Menu ViewPublicKitMenu(Player p, String id) {
             menu.getSlot(i + 9).setItem(kit[i]);
         }
 
-        menu.getSlot(CLEAR_SLOT).setItem(createItem(Material.APPLE, 1, "<green><b>LOAD KIT</b></green>"));
+        menu.getSlot(LOAD_PUBLIC_KIT_SLOT).setItem(createItem(Material.APPLE, 1, "<green><b>LOAD KIT</b></green>"));
         menu.getSlot(BACK_SLOT).setItem(createItem(Material.OAK_DOOR, 1, "<red><b>BACK</b></red>"));
         addPublicKitMenu(menu.getSlot(BACK_SLOT));
-        addLoadPublicKit(menu.getSlot(CLEAR_SLOT), id);
+        addLoadPublicKit(menu.getSlot(LOAD_PUBLIC_KIT_SLOT), id);
 
         menu.open(p);
 

src/main/java/dev/noah/perplayerkit/gui/GuiLayoutUtils.java

@@ -34,6 +34,7 @@ public final class GuiLayoutUtils {
     public static final int ARMOR_INDICATOR_START = 45;
     public static final int OFFHAND_INDICATOR_SLOT = 49;
     public static final int IMPORT_SLOT = 51;
+    public static final int LOAD_PUBLIC_KIT_SLOT = 52;
     public static final int CLEAR_SLOT = 52;
     public static final int BACK_SLOT = 53;