Fix label compare of distance method

[sooahleex]

Summary

• Fix label comparison result of distance method
• Example: dataset1 included label ['a', 'b] and dataset2 included label ['background', 'a', 'b', 'c']
  • Expected Result :
    < c
    < background
  • Actual Result:
    a != background
    b != a
    < b
    < c
• Ticket no. 124879

How to test

Checklist

• I have added unit tests to cover my changes.​
• I have added integration tests to cover my changes.​
• I have added the description of my changes into CHANGELOG.​
• I have updated the documentation accordingly

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• I have updated the license header for each file (see an example below).

# Copyright (C) 2023 Intel Corporation
#
# SPDX-License-Identifier: MIT

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (27e3804) 80.07% compared to head (3547784) 80.08%.

❗ Current head 3547784 differs from pull request most recent head 2ae3c13. Consider uploading reports for the commit 2ae3c13 to get more accurate results

Files	Patch %	Lines
src/datumaro/cli/util/compare.py	0.00%	7 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1205   +/-   ##
========================================
  Coverage    80.07%   80.08%           
========================================
  Files          268      268           
  Lines        29865    29863    -2     
  Branches      5846     5845    -1     
========================================
+ Hits         23915    23916    +1     
+ Misses        4617     4614    -3     
  Partials      1333     1333           

Flag	Coverage Δ
macos-11_Python-3.8	79.20% <22.22%> (+<0.01%)	⬆️
ubuntu-20.04_Python-3.8	80.07% <22.22%> (+<0.01%)	⬆️
windows-2022_Python-3.8	80.05% <22.22%> (+<0.01%)	⬆️

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[vinnamkim]

LGTM.