Added switcher to maintain poylgon crop behaviour (#2961)

[bsekachev]

Motivation and context

Resolved #2961

Added setting:

How has this been tested?

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

[bsekachev]

Hi @dvkruchinin

We need a test for the feature when it will be merged

[dvkruchinin]

Hi @bsekachev

We need a test for the feature when it will be merged

A test will be prepared.

[coveralls]

Coverage increased (+0.007%) to 74.973% when pulling fd7795b on bs/issue_2961 into 57385fa on develop.