Enhance mAh remaining OSD element

[MrD-RC]

Increase the precision of the mAh remaining OSD element. This is to partner the mAh used element which had this change a couple of versions ago. Many packs are now more than 9999mAh. This change supports that.

Requires configurator iNavFlight/inav-configurator#1845

Release Notes

If you have previously used the osd_mah_used_precision parameter. This is now osd_mah_precision.

[MrD-RC]

If someone with DJI could test this, I'd be grateful 👍🏻

[Zufallsgenerat0r]

I would like to help testing this PR but wondering about the steps involved.

My steps would be:

• Flash current stable version
• Set the mAh remaining OSD element
• Set a battery capacity higher than 9999mAh
• Connect with DJI googles
• Expect the element to be broken

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• Flash the version in this PR
• Set the mAh remaining OSD element
• Set a battery capacity higher than 9999mAh
• Connect with DJI googles
• Expect the element to show correctly

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Are the steps in line with what you think should be done.
The only thing I don't have to do that is a battery with that high capacity but do I need it to do the testing? If I do could I fake it?

[MrD-RC]

@Zufallsgenerat0r currently with DJI, it will only show 4 digits for capacity remaining. With this change, it should have 5. You should just be able to set the battery capacity in Configurator to 10050 mAh, for example. This capacity should display incorrectly on the current stable release. But should be fine on this PR.