Resolve "[DACC] - Les variations de consommation sont inversées"

What does this MR do and why?

Correct issue on consumption variation calculation sign

⚠ Keep an up to date checklist based on your icescrum tasks during all the draft phase to help any other developer who would take the job after you to finish it.

Screenshots or screen recordings

These are strongly recommended to assist reviewers and reduce the time to merge your change.

How to set up and validate locally (or on alpha)

1. Procédure de validation mail :

• Changer le path local en

Ceci est lié a un problème sur le backoffice de recette

• Réaliser le test

yarn build-dev
yarn run cozy-konnector-dev -m manifest.webapp build/services/monthlyReportNotification/ecolyo.js

• Valider le mail a l'url suivante : http://localhost:8025/

2. Procédure de test du dacc : https://doc.self-data.alpha.grandlyon.com/ecolyo/functionalities/dacc/#how-to-local-test

MR acceptance checklist

• Valider que le % de baisse ou d'augmentation est le bon du mois a l'autre http://ecolyo.cozy.tools:8080/#/analysis
• Valider que l'envoi de mail possède le bon signe d'augmentation/baisse
• Valider le signe avec l'envoi au dacc

Quality

• Confirmed

1. For the code that this change impacts, I believe that the automated tests validate functionality that is highly important to users. If the existing automated tests do not cover this functionality, I have added the necessary additional tests or I have added an issue to describe the automation testing gap and linked it to this MR.
2. I have made sure that the sonar quality coverage is up to standards.
3. I have considered the impact of this change on the front-end, back-end, and database portions of the system where appropriate and applied.
4. I have tested this MR in all supported browsers or determined that this testing is not needed.
5. I have confirmed that this change is backwards compatible across updates (migrate up needs a migrate down), or I have decided that this does not apply.

Performance, reliability and availability

• Confirmed

1. I am confident that this MR does not harm performance, or I have asked a reviewer to help assess the performance impact.
2. I have considered the scalability risk based on future predicted growth.

Documentation

• Confirmed

1. I have prepared a squash commit to feed the changelog linked to the current milestone.
2. I have added/updated documentation (also updated if the changes feature a deprecation) or I have decided that documentation changes are not needed for this MR.

Security

• Confirmed

1. I have confirmed that if this MR does not contains any sensitive informations hidden in the changes.

Deployment

• Confirmed

1. When featured on a self-data project release, i have made sure my app version in the manifest and package.json is incremented and any relative changes to the permissions are clearly written and transmitted to Cozy.

Closes #263 (closed)