[GH-467] Unequip previously equipped item on equip #689
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Motivation
Items of the same type were not being unequipped when a unit equipped another one. We marked this as a bug instead of a feature because we thought it was already inclemented, but it seems like we just never actually did it.
Closes lambdaclass/afk_gacha_game#467
Summary of changes
How to test it?
Create two items, or use the ones you gain by winning the first few levels of the campaign. Equip one of them to a unit. Then equip the other one (of the same type). Query the initial one, and you should see that its'
unit_id
isnil