Revert "Add km_kh locale"

[jama5262]

@Kuntheasoung reverting your changes due to tests failing

Theses are the changes from https://github.com/jama5262/jiffy/pull/234, please fix you tests for adding the km_kh locale

You can always reopen a new PR by reverting the changes of this PR, the button to revert the changes is below

Once reverted make sure the dart format and tests are working. You can check them by using

If in Windows run the following in the terminal

• .\bin\dart_analyze.bat to analyze dart code
• .\bin\dart_format.bat to format dart code
• .\bin\dart_test.bat to run test and make sure they pass

If in Linux or Mac

• .\bin\dart_analyze.sh to analyze dart code
• .\bin\dart_format.sh to format dart code
• .\bin\dart_test.sh to run test and make sure they pass

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (657603c) 96.32% compared to head (beac4d3) 96.32%.

:exclamation: Current head beac4d3 differs from pull request most recent head 84e052a. Consider uploading reports for the commit 84e052a to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #238 +/- ## ======================================= Coverage 96.32% 96.32% ======================================= Files 34 34 Lines 1550 1550 ======================================= Hits 1493 1493 Misses 57 57 ```

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