LargeValueFormatter not convert some value properly. for example 1200 to 1.2k

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## What did you do?

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## What did you expect to happen?

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## What happened instead?

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## Charts Environment

**Charts version/Branch/Commit Number:**
**Xcode version:** 14.1.1
**Swift version:** 5
**Platform(s) running Charts:**
**macOS version running Xcode:**12.5.1

## Demo Project

ℹ Please link to or upload a project we can download that reproduces the issue.

No source file, test, reproduction project, platform details, or concrete expected-versus-actual example is provided. Start by locating LargeValueFormatter in the Charts codebase and inspect its existing tests or formatting behavior; done means values such as 1200 format as 1.2k without regressions.

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