Allow negative degradation for vehicles with range extenders installed.

🚧 THIS IS A TICKET MIGRATED FROM UPVOTY. The original ticket and comments will be available for a limited time over at:
https://abrp.upvoty.com/b/request-a-feature/allow-negative-degradation-for-vehicles-with-range-extenders-installed/
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Range extenders are available for multiple vehicles, especially the leaf. Perhaps consider allowing negative degradation, or a specific section for range extenders.