Fixes flake8 lint by removing duplicate import

[sobolevn]

Pre-submission checklist

• I've ran the linters locally and fixed lint errors related to the files I modified in this PR. You can install the linters by running pip install -r requirements-dev.txt && pre-commit install
  • pre-commit run

Nope, sorry. I think this is easy enough to be done via just the GitHub editor 🙂

Summary

flake8 was failing with:

flake8...................................................................Failed
- hook id: flake8
- exit code: 1

client/commands/v2/persistent.py:40:1: F811 redefinition of unused 'query' from line 40

Test Plan

🤔

[arthaud]

Closing this since this is old and hopefully the problem is resolved now?