BUG: Fix raw parameter not being respected in groupby.rolling.apply
- [x] closes #31754
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry

thanks @mroeschke  @mroeschke can you check if this was backported? Don't see it in https://github.com/pandas-dev/pandas/commits/1.0.x. I'll backport it when I get a chance @MeeseeksDev backport to 1.0.x @mroeschke I mentioned it on the core list as well now, but know that often commenting with what I did above is enough, which can avoid you need to take the time to manually backport. Thanks @jorisvandenbossche. Sorry I forgot to revisit this and backport this PR 