Put the discount code when creating the reservation as well as at the end.

Feedback collected from: https://hotelgest.featurebase.app/changelog/tada-unified-340-beta-publica-esta-aqui-tada-2

We could offer the discount in the first step of creating reservation, use that discount for all rooms in the last step and show the options now to be able to change, adjust or edit it. This way we would have both options covered.

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