[MC-83620] Placing items on armor stand from off-hand impossible

The bug

If you try to put an item on an armor stand with the off-hand, nothing happens.

Fix

EntityArmorStand.java

public EnumActionResult applyPlayerInteraction(EntityPlayer player, Vec3d vec, EnumHand stack)
    {
        ItemStack itemstack = player.getHeldItem(stack);
		
        if (!this.hasMarker() && itemstack.getItem() != Items.NAME_TAG)
        {
//          if (!this.world.isRemote && !player.isSpectator())
++          if (!player.isSpectator())
            {
                EntityEquipmentSlot entityequipmentslot = EntityLiving.getSlotForItemStack(itemstack);

                if (itemstack.isEmpty())
                {
                    EntityEquipmentSlot entityequipmentslot1 = this.getClickedSlot(vec);
                    EntityEquipmentSlot entityequipmentslot2 = this.isDisabled(entityequipmentslot1) ? entityequipmentslot : entityequipmentslot1;

                    if (this.hasItemInSlot(entityequipmentslot2))
                    {
                        this.swapItem(player, entityequipmentslot2, itemstack, stack);
++                      return EnumActionResult.SUCCESS;
                    }
                    
++                  return EnumActionResult.FAIL;
                }
                else
                {
                    if (this.isDisabled(entityequipmentslot))
                    {
                        return EnumActionResult.FAIL;
                    }

                    if (entityequipmentslot.getSlotType() == EntityEquipmentSlot.Type.HAND && !this.getShowArms())
                    {
                        return EnumActionResult.FAIL;
                    }

                    this.swapItem(player, entityequipmentslot, itemstack, stack);
                }

                return EnumActionResult.SUCCESS;
            }
            else
            {
//              return EnumActionResult.SUCCESS;
++              return EnumActionResult.PASS;
            }
        }
        else
        {
            return EnumActionResult.PASS;
        }
    }