[clang] [Clang] Fix '-Wformat-overflow' FP when floats had field-width and plus prefix (PR #144274)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman approved this pull request.

LGTM aside from a nit with the release note. Thank you for the fix!

https://github.com/llvm/llvm-project/pull/144274