adjust battery voltage threshold to allow for very dead batteries (do…

[tototo31]

…wn to ~2.0V)

What's new (Author - fill this out)

Changed

• Lowered the low battery threshhold to account for devices with dead batteries

Removed

Verification (Author - fill this out)

• I have tested Primary device(s) (list exact HW + config): Tdeck
• I have tested potentially affected devices (and/or list potential affected devices not available to you): Need help testing other fuelgage devices
• I have wrapped device specific code with #ifdef CONFIG_... or similar: [ ] Yes / [ x] N/A
• I have updated Hugo Docs with any new or changed info for end users: [ ] Yes / [ x] N/A

Linked Issues

• Closes #

Checklist (Reviewer - don't fill this out)

• Code builds, flashes, and feature verified with no functional issues on listed device(s)
• Changes reviewed for unintended impact on other devices/targets

[tototo31]

Fixed this when battery is low