BUG: pd.crosstab fails when passed multiple columns, margins True and normalize True
- [x] closes #35144
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

can you merge master and will look again > can you merge master and will look again

Done. @jreback I'll go on vacation on Friday would be great if we can get this done before that. Otherwise I'll finish this at the beginning of September. thanks @CloseChoice lgtm.
