Removed unnecessary dict calls
xref #38138

File modified:
pandas/tests/io/parser/test_quoting.py
pandas/tests/io/parser/test_usecols.py

- [ ] closes #xxxx
- [ ] tests added / passed
- [ ] passes `black pandas`
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry
