Switch parameters with battery capacity unit

[MrD-RC]

There is a parameter for the OSD called osd_stats_energy_unit. This selects whether mAh or Wh are displayed on the end of flight stats screen. People are confused the when the switch the battery capacity unit to Wh from Ah, this value doesn't change.

This PR will change osd_stats_energy_unit to match the battery capacity unit if it changes. This will be more an expected behavior. Plus it gives pilots the option to change to the other units for the stats if they want.

[breadoven]

This appears to be causing a lockup on disarm on some configurations. Happens on a couple of planes with F4 boards, but not on a multirotor with an F7 board, could be the board or airframe type ?. It's caused by the cli.c change. With that change included it locks up immediately when you disarm, doesn't when your remove it.

[MrD-RC]

Thanks @breadoven. I came across the issue at the weekend. Thanks for finding the cause. I hadn't had time to investigate. I'll work on a fix.

[breadoven]

Seems it's caused by battery_capacity_unit being set to MWH. The quad was set to MAH and wasn't affected but if you change it to MWH it locks up on disarm. I'm guessing some sort of Config mismatch perhaps.

Have to admit I completely discounted this change as the culprit when I was checking the master merge changes to find the cause. A pain to diagnose when it locks up completely.

[MrD-RC]

@breadoven yes, the issue is when osd_stats_energy_unit = wh rather than the change here. This change has just highlighted the issue. It's more likely related to the disarm screen on the OSD. Switching osd_stats_energy_unit to mah without changing any code gets rid of the disarm hang.

[breadoven]

You're right, setting osd_stats_energy_unit = wh causes the same lockup even with the cli.c code removed.

[MrD-RC]

Fixed in #10413