Issue Description:

If you craft a stack (2-16) of upgrades into a backpack, it will consume 1 (as expected).
When you remove the upgrades from the backpack, it gives back the amount of upgrades that were in the original stack.

What happens:

Multiple upgrades are given back when you remove them.

What you expected to happen:

Only one upgrade should be returned.

Steps to reproduce (important):

1. Get any backpack and 2 or more identical upgrades.
2. Craft the upgrades with the backpack, with all of the upgrades in a single stack.
3. Craft the backpack on it's own to remove the upgrade, you should get back multiples.

I made a quick video to show off this bug in action.

Affected Versions (Do not use "latest"):

• IronBackpacks: 1.10.2-2.2.19
• Minecraft: 1.10.2
• Forge: 12.18.3.2185