[Bleeding] Re-add missed diff in 1.7.5 update. Fixes BUKKIT-5536

In the 1.7.5 update the diff that called book edit events when editing
books was accidentally dropped because of nms changes within the file.
This commit re-adds the craftbukkit call to restore event behavior.

src/main/java/net/minecraft/server/PlayerConnection.java

@@ -1665,7 +1665,7 @@ public class PlayerConnection implements PacketPlayInListener {
                 itemstack1 = this.player.inventory.getItemInHand();
                 if (itemstack1 != null) {
                     if (itemstack.getItem() == Items.BOOK_AND_QUILL && itemstack.getItem() == itemstack1.getItem()) {
-                        itemstack1.a("pages", (NBTBase) itemstack.getTag().getList("pages", 8));
+                        CraftEventFactory.handleEditBookEvent(player, itemstack); // CraftBukkit
                     }
 
                     return;