Set current SoC in trip screen

🚧 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/set-current-soc-in-trip-screen/
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When planning a trip, ABRP uses the SoC that is set in the settings for the start of the trip. However, in real life, the SoC at the start of a trip is different every time. When planning a trip, it would be easier to enter the current SoC directly in the planning screen, instead of having to go to the settings first.