BUG: display.precision of negative complex numbers
- [x] closes #27484
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry

LGTM lgtm. going to see if I can fix the CI on 0.25.1 first. can you rebase this @mroeschke  Rebased and green. Thanks @mroeschke 