Fix Mapillary Vistas data format

[wonjuleee]

Summary

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-commenter]

Codecov Report

Patch coverage: 78.00% and project coverage change: -0.04 ⚠️

Comparison is base (d202060) 78.74% compared to head (483fd94) 78.70%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #977      +/-   ##
===========================================
- Coverage    78.74%   78.70%   -0.04%     
===========================================
  Files          231      231              
  Lines        26463    26454       -9     
  Branches      5263     5261       -2     
===========================================
- Hits         20837    20820      -17     
- Misses        4401     4407       +6     
- Partials      1225     1227       +2     

Flag	Coverage Δ
macos-11_Python-3.8	77.74% <78.00%> (-0.03%)	⬇️
ubuntu-20.04_Python-3.8	78.69% <78.00%> (-0.03%)	⬇️
windows-2019_Python-3.8	?

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

Impacted Files	Coverage Δ
.../plugins/data_formats/mapillary_vistas/importer.py	75.47% <20.00%> (-4.13%)	⬇️
...maro/plugins/data_formats/mapillary_vistas/base.py	87.34% <84.09%> (-1.04%)	⬇️
...ro/plugins/data_formats/mapillary_vistas/format.py	94.87% <100.00%> (ø)

... and 3 files with indirect coverage changes

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[vinnamkim]

LGTM.