BUG: Rolling negative window issue fix #13383
- [x] closes #13383 
- [x] tests added / passed
- [x] passes `git diff upstream/master | flake8 --diff`
- [x] whatsnew entry

Added functionality in validate function of Rolling to ensure that window size is non-negative.

## [Current coverage](https://codecov.io/gh/pydata/pandas/pull/13441?src=pr) is **84.32%**

> Merging [#13441](https://codecov.io/gh/pydata/pandas/pull/13441?src=pr) into [master](https://codecov.io/gh/pydata/pandas/branch/master?src=pr) will increase coverage by **<.01%**

``` diff
@@             master     #13441   diff @@
==========================================
  Files           138        138          
  Lines         51068      51072     +4   
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
+ Hits          43065      43069     +4   
  Misses         8003       8003          
  Partials          0          0          
```

> Powered by [Codecov](https://codecov.io?src=pr). Last updated by [b06bc7a...26c9b2d](https://codecov.io/gh/pydata/pandas/compare/b06bc7ab10552079b5300f53ae9458b5b1583402...26c9b2d2f57a3d474ea33baba28e6e83509baf22)
 thanks!
