fix(medusa): Complete cart with 100% discount

[olivermrbl]

What Naive fix to allow carts with 100% discount to be completed.

Why Discount total is wrongly calculated if items and items.adjustments is not included in relations upon retrieving the cart.

Thought This is yet another example of why we need to rethink and refactor totals computation to not depend on what is provided by the user.

[changeset-bot[bot]]

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Latest commit: 845f85a2c9a0d78eaa2ca09f2359dd86c22f48c9

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