fix: skip last header line in csv

[dipietroR]

Seeing:

Argument "Transformation" isn't numeric in addition (+) at /opt/product-opener/lib/ProductOpener/Ecoscore.pm line 139, <$io> line 8.
Argument "Emballage" isn't numeric in addition (+) at /opt/product-opener/lib/ProductOpener/Ecoscore.pm line 139, <$io> line 8.
Argument "Transport" isn't numeric in addition (+) at /opt/product-opener/lib/ProductOpener/Ecoscore.pm line 139, <$io> line 8.
Argument "Supermarch\x{e9} et distribution" isn't numeric in addition (+) at /opt/product-opener/lib/ProductOpener/Ecoscore.pm line 139, <$io> line 8.

Errors. This may be from adding 0 to an undefined value rather than using a default.

There was no ecoscore popping up on the products on the local dev environment. I see them on the app. Though I'm not sure how to test there. Or quite what to test on the dev environment, as I don't see the ecoscore there to check that it is still there after this change. This does seem to clear the errors on startup.

[alexgarel]

This PR is a good idea, but I think you should ensure we have ints.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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[alexgarel]

Cool