Behatsdaa txns should be positive if expenses, same as the rest of the cards

[liranelisha]

closes #851

This pull request contains a small but significant change in the src/scrapers/behatsdaa.ts file. The variantToTransaction function has been modified to no longer negate the customerPrice when assigning it to originalAmount. This means that the transaction amount will now be represented as a positive value, rather than a negative one.

[baruchiro]

Your change is wrong. As the comment said

The price is positive, make it negative as it's an expense

As you can see, I debugged your change, and it looks like the price is indeed positive, and we need to negate it.

Even while I'm writing this message, I'm confused because issue #851 and this PR are saying the opposite.