Fix MVTec format detect function

[vinnamkim]

Summary

• Ticket no. 105561

How to test

I changed the existing tests after fixing detectability for MVTec.

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 project coverage change: +0.04 🎉

Comparison is base (f1c467a) 78.49% compared to head (619546f) 78.54%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #843      +/-   ##
===========================================
+ Coverage    78.49%   78.54%   +0.04%     
===========================================
  Files          196      196              
  Lines        24189    24231      +42     
  Branches      4907     4909       +2     
===========================================
+ Hits         18987    19032      +45     
+ Misses        4113     4110       -3     
  Partials      1089     1089              

Flag	Coverage Δ
macos-11_Python-3.8	77.88% <100.00%> (+0.05%)	⬆️
ubuntu-20.04_Python-3.8	78.53% <100.00%> (+0.05%)	⬆️
windows-2019_Python-3.8	78.47% <100.00%> (+0.05%)	⬆️

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

Impacted Files	Coverage Δ
datumaro/plugins/data_formats/mvtec/importer.py	100.00% <100.00%> (ø)

... and 6 files with indirect coverage changes

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