Bug fixed: charging indication on heltec/lora32

While working on something else, I happened to notice the cause of something many have complained about: charging indication was wrong on any board that used a ‘dumb’ analog voltage sensor. I just fixed it and it will be out in the next release…

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chargingVolt = 4.3

I actually see readings of about ~4.1 when I’m actively charging a battery and the cell is topped. Either the charger end-cycle point or the equivalent parallel resistance of the cell may be contributing to that.

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