Fix logic to reset Slurm accounting password after queue update

[jdeamicis]

Description of changes

• Fix logic to reset Slurm accounting password after queue update
  • the logic introduced in Fix Slurm accounting password being overridden at queue update #2006 was wrong.

Tests

• Performed a manual run of:
  • schedulers/test_slurm_accounting.py::test_slurm_accounting
  • schedulers/test_slurm.py::test_slurm_config_update
  • update/test_update.py::test_update_instance_list

Checklist

• Make sure you are pointing to the right branch and add a label in the PR title (i.e. 2.x vs 3.x)
• Check all commits' messages are clear, describing what and why vs how.
• Make sure to have added unit tests or integration tests to cover the new/modified code.
• Check if documentation is impacted by this change.

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[codecov]

Codecov Report

Merging #2015 (a5fd564) into develop (e70cff8) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #2015   +/-   ##
========================================
  Coverage    69.42%   69.42%           
========================================
  Files           12       12           
  Lines         1766     1766           
========================================
  Hits          1226     1226           
  Misses         540      540           

Flag	Coverage Δ
unittests	69.42% <ø> (ø)

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