Don't ignore result of PlayerEditBookEvent

paper-server/patches/sources/net/minecraft/server/network/ServerGamePacketListenerImpl.java.patch

@@ -599,7 +599,7 @@
              List<Filterable<String>> list1 = pages.stream().map(this::filterableFromOutgoing).toList();
  
              itemstack.set(DataComponents.WRITABLE_BOOK_CONTENT, new WritableBookContent(list1));
-+            CraftEventFactory.handleEditBookEvent(this.player, slotId, handItem, itemstack); // CraftBukkit
++            this.player.getInventory().setItem(slotId, CraftEventFactory.handleEditBookEvent(this.player, slotId, handItem, itemstack)); // CraftBukkit // Paper - Don't ignore result (see other callsite for handleEditBookEvent)
          }
      }