Fix CIFAR10 and 100 detect function

[vinnamkim]

Summary

• Ticket no. 105476
• Fix CIFAR-10 and CIFAR-100 detect function.

How to test

This change is covered by the existing tests.

Checklist

• I submit my changes into the develop branch
• I have added description of my changes into CHANGELOG
• I have updated the documentation accordingly
• I have added tests to cover my changes
• I have linked related issues

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-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change

Comparison is base (93df9d1) 78.46% compared to head (0d335e3) 78.47%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #836   +/-   ##
========================================
  Coverage    78.46%   78.47%           
========================================
  Files          196      196           
  Lines        24304    24320   +16     
  Branches      4946     4948    +2     
========================================
+ Hits         19071    19084   +13     
- Misses        4131     4133    +2     
- Partials      1102     1103    +1     

Flag	Coverage Δ
ubuntu-20.04_Python-3.8	78.47% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
datumaro/plugins/data_formats/cifar.py	87.17% <100.00%> (-0.54%)	⬇️

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[bonhunko]

modified find_sources() looks great.
I left a question about detect() function.

[bonhunko]

LGTM!