Pass check_dtype to assert_extension_array_equal
- [x] closes #35715
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`

Hello @dsaxton! Thanks for updating this PR. We checked the lines you've touched for [PEP 8](https://www.python.org/dev/peps/pep-0008) issues, and found:









There are currently no PEP 8 issues detected in this Pull Request. Cheers! :beers: 

##### Comment last updated at 2020-08-17 17:22:43 UTC i've milestoned this 1.1.1. It does not appear to be a regression but no harm in backporting this. can put in bugfix section of whatsnew thanks @dsaxton very nice @meeseeksdev backport 1.1.x

