Fix g force calculation

[Schuwi]

This line of code seems to have been lost in this refactor. Without it the G force indicator in the OSD only works until about 1.5-2G. When it gets any higher the value seems to accumulate and the OSD shows fluctuating garbage values of "0.xG" (x = random digit).

I tested the same code change on v4.4.2 and it worked, showing plausible values. I did not yet test it on master branch.

I did not manage to run either make pre-push or make unified_zip. Both failed with "No rule to make target [...]". Am I doing something wrong or is the PR preset just outdated?

[github-actions]

Do you want to test this code? You can flash it directly from Betaflight Configurator:

• Simply put #12892 (this pull request number) in the Select commit field of the Configurator firmware flasher tab (you need to Enable expert mode, Show release candidates and Development).

WARNING: It may be unstable. Use only for testing!

[haslinghuis]

make configs
make all_rev

should work

[blckmn]

AUTOMERGE: (FAIL)

• github identifies PR as mergeable -> FAIL
• assigned to a milestone -> PASS
• cooling off period lapsed -> PASS
• commit count less or equal to three -> PASS
• Don't merge label NOT found -> PASS
• at least one RN: label found -> PASS
• Tested label found -> FAIL
• assigned to an approver -> FAIL
• approver count at least three -> FAIL