Remove dead code, param renames in added methods

paper-server/patches/sources/net/minecraft/world/entity/Entity.java.patch

@@ -974,13 +974,12 @@
                          leashable.removeLeash();
                      } else {
                          leashable.dropLeash();
-@@ -2043,6 +_,14 @@
+@@ -2043,6 +_,13 @@
              ItemStack itemInHand = player.getItemInHand(hand);
              if (itemInHand.is(Items.LEAD) && leashable.canHaveALeashAttachedToIt()) {
                  if (!this.level().isClientSide()) {
 +                    // CraftBukkit start - fire PlayerLeashEntityEvent
 +                    if (org.bukkit.craftbukkit.event.CraftEventFactory.callPlayerLeashEntityEvent(this, player, player, hand).isCancelled()) {
-+                        // ((ServerPlayer) player).resendItemInHands(); // SPIGOT-7615: Resend to fix client desync with used item // Paper - Fix inventory desync
 +                        ((ServerPlayer) player).connection.send(new net.minecraft.network.protocol.game.ClientboundSetEntityLinkPacket(this, leashable.getLeashHolder()));
 +                        player.containerMenu.sendAllDataToRemote(); // Paper - Fix inventory desync
 +                        return InteractionResult.PASS;