💰 Fix incorrect calculation in Olivia's baguette spending logic

[defiberrys]

What does this PR do?

I noticed a mistake in the calculation of Olivia's remaining money.

Previously, it was incorrectly calculated that Olivia had $10 left after buying baguettes. However, if she spent $3 on each of the 5 baguettes, she spent a total of $15. Since she initially had $23, the correct remaining amount is $8.

I've updated the logic to reflect this.

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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• Did you write any new necessary tests?

Who can review?

Anyone

[qgallouedec]

Give the money back Olivia!

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