Rename file in the wrong encoding

[evgenytalanin-intel]

Motivation and context

One of the files with tests was named in the wrong encoding causing some internal automation to fail

How has this been tested?

This was checked with the custom job on top of develop branch, however the fix is quite trivial to be seamlessly cherry-picked to any of branches.

Checklist

• I submit my changes into the develop branch
• I have added description of my changes into CHANGELOG file
• I have updated the documentation accordingly
• I have added tests to cover my changes
• I have linked related issues (read github docs)
• I have increased versions of npm packages if it is necessary (cvat-canvas,
  cvat-core, cvat-data and cvat-ui)

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) 2021 Intel Corporation
#
# SPDX-License-Identifier: MIT

[evgenytalanin-intel]

One of failing tests is fixed in #3683, while another looks like sporadic timeout issue (I've restarted checks after the different one failed with timeout)y. I hate this wording but - failures are not related to my change :)

[nmanovic]

@evgenytalanin-intel , thanks for the contribution. The test was fixed in another PR: #3683