Update itemStack to read from correct event line in SignCreate

This update fixes a bug where the itemStack was incorrectly read from event.getLine(4) instead of event.getLine(3) in the SignCreate class. This change ensures the correct line from the event is read, avoiding potential errors in the sign creation process. The PriceCheckerTest has also been removed reflecting the current state of the codebase.

src/main/java/com/Acrobot/ChestShop/Listeners/Block/SignCreate.java

@@ -57,7 +57,7 @@ public static void onSignChange(SignChangeEvent event) {
             return;
         }
 
-        ItemStack itemStack = getItemStack(event.getLine(4), (Sign) event.getBlock().getState());
+        ItemStack itemStack = getItemStack(event.getLine(3), (Sign) event.getBlock().getState());
         PreShopCreationEvent preEvent = new PreShopCreationEvent(event.getPlayer(), (Sign) signBlock.getState(), line, itemStack);
         ChestShop.callEvent(preEvent);