Fixed swapping stacks of the same item if the end stack is at max stack size

[CorranEveryone]

All I added is an if statement to the item swapping code, preventing it from swapping if the end stack is already at max.
I tested this on my N0120 and it works fine (I did encounter trial and error but I got it working in the end).

Also yes, I did make sure to include this fix in both the in same inventory item swapping and different inventory item swapping.

[yannis300307]

Thank you for your contribution! I can't test the code this week but I will look into your PR as soon as I am available.

[CorranEveryone]

Sounds good

[yannis300307]

Hello, I reviewed your PR. The issue I have with this change is that swapping a slot with a maxed other can be voluntary when the player sorts its inventory. Also, this PR breaks the swapping of 2 maxed stacks with different types. Tell me back if you really think that this feature must be added and in which case the previous behavior can be a problem.

[CorranEveryone]

I didn't catch that bug. This is how it works in the original version of the game.

[yannis300307]

I personally think that this behavior should remain the same. My goal is not to reproduce Minecraft at 1:1.