Fix ItemStack conversion on block place on MC 1.21 (#2093)

* Fix ItemStack conversion on block place

This issue is present in 1.21 because some materials do not convert 1:1 to item types.
This throws an exception in the ItemStack constructor.
Example: WALL_TORCH is a valid block but not a valid item, only TORCH is a valid item.

So, use the item in hand instead, creating a copy with quantity set to 1, for issueing the
use item event.

* Use ItemStack as-is.

Closes #2092.

---------

Co-authored-by: wizjany <wizjany@gmail.com>

Author: lenis0012

worldguard-bukkit/src/main/java/com/sk89q/worldguard/bukkit/listener/EventAbstractionListener.java

@@ -218,8 +218,8 @@ public void onBlockPlace(BlockPlaceEvent event) {
             Events.fireToCancel(event, new BreakBlockEvent(event, create(event.getPlayer()), previousState.getLocation(), previousState.getType()));
         }
 
-        if (!event.isCancelled()) {
-            ItemStack itemStack = new ItemStack(event.getBlockPlaced().getType(), 1);
+        ItemStack itemStack = event.getItemInHand();
+        if (!event.isCancelled() && !itemStack.isEmpty()) {
             Events.fireToCancel(event, new UseItemEvent(event, create(event.getPlayer()), event.getPlayer().getWorld(), itemStack));
         }