Drop redundant TestLocale
We have the `TestLocaleUtils` class in `tests/util/test_util.py`
https://github.com/pandas-dev/pandas/blob/master/pandas/tests/util/test_util.py#L421
which is more comprehensive and includes `test_get_locales` which is functionally identical.

- [ ] closes #xxxx
- [ ] tests added / passed
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

Should we move the reference to #9744 over to `test_get_locales` ? @ginggs : Yeah, why not.  Let's do that. # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/22349?src=pr&el=h1) Report
> Merging [#22349](https://codecov.io/gh/pandas-dev/pandas/pull/22349?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/cf70d11a25ec59a5b630921d86759c7fa49884db?src=pr&el=desc) will **not change** coverage.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/22349/graphs/tree.svg?src=pr&width=650&token=eZ4WkYLtcO&height=150)](https://codecov.io/gh/pandas-dev/pandas/pull/22349?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #22349   +/-   ##
=======================================
  Coverage   92.05%   92.05%           
=======================================
  Files         169      169           
  Lines       50709    50709           
=======================================
  Hits        46679    46679           
  Misses       4030     4030
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.46% <ø> (ø)` | :arrow_up: |
| #single | `42.25% <ø> (ø)` | :arrow_up: |


------

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 Hmm I suppose the only difference here is that the previous test was only skipped on 32 bit windows but assumedly held for 64 bit. With the refactor it is skipped for both.

My knowledge of Windows locale is nil, but any concern about the change here for 64 bit Windows? Maybe the target class' skip decorator should only apply to 32 bit Windows? Apparently `sys.platform` is `win32` even on 64-bit Windows:
https://mail.python.org/pipermail/patches/2000-May/000648.html thanks!