Fix new flake8 warnings

[joshmoore]

Especially "E741 ambiguous variable name".
see: ome/openmicroscopy#6236

[joshmoore]

cc: @manics @will-moore

This is needed to get #168 passing

[will-moore]

Looks good 👍

[snoopycrimecop]

Conflicting PR. Removed from build OMERO-python-superbuild-push#334. See the console output for more details.
Possible conflicts:

• PR api_experimenters_groups #148 will-moore 'api_experimenters_groups'
  • omeroweb/webclient/webclient_gateway.py
• PR public user workflow crash #154 will-moore 'public user workflow crash'
  • omeroweb/webclient/webclient_gateway.py

--conflicts Conflict resolved in build OMERO-python-superbuild-push#335. See the console output for more details.

[will-moore]

@joshmoore conflict with #148

I can close that if you just want to get this in? Then rebase etc.

[joshmoore]

Thanks. I went ahead and added --exclude to the description of #148. I'll re-run the build and see how things are this evening.

[joshmoore]

Re-run https://merge-ci.openmicroscopy.org/jenkins/job/OMERO-test-integration/415/ passed with 9 seemingly unrelated failures. Merging to unblock #148 and we can re-address as necessary.