OSD flight efficiency formatting fix

[breadoven]

Should close #11550.

Needs testing.

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[github-actions]

Test firmware build ready — commit 4bec42c

Download firmware for PR #11556

234 targets built. Find your board's .hex file by name on that page (e.g. MATEKF405SE.hex). Files are individually downloadable — no GitHub login required.

Development build for testing only. Use Full Chip Erase when flashing.

[Jetrell]

Tested today, This has fixed the issue.

[breadoven]

Tested today, This has fixed the issue.

Hmmm, unfortunately the related code has changed (#11405) so this PR will need tweaking unless @sensei-hacker includes a fix in #11573 (assuming the recent changes haven't already fixed it of course).

Edit: PR tweaked to take account of #11405.