CauldronLevelChangeEvent does not use new level

By: md_5 <git@md-5.net>

paper-server/nms-patches/BlockCauldron.patch

@@ -157,7 +157,7 @@
 +        if (event.isCancelled()) {
 +            return false;
 +        }
-+        world.setTypeAndData(blockposition, iblockdata.set(BlockCauldron.LEVEL, newLevel), 2);
++        world.setTypeAndData(blockposition, iblockdata.set(BlockCauldron.LEVEL, event.getNewLevel()), 2);
          world.updateAdjacentComparators(blockposition, this);
 +        return true;
 +        // CraftBukkit end