Cypress. Fix case 78 for PR 4007. Set color for second label.

[dvkruchinin]

Hi @azhavoro,
As we agreed, I have some reworked the test for your PR. Please take a look.

Motivation and context

Comparing images:


Apparently, jimp does not see any difference in them and an error occurs that the images are not different.
Added a color change for the second label to red.

How has this been tested?

Checklist

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• I have updated the documentation accordingly
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  cvat-core, cvat-data and cvat-ui)

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  Feel free to contact the maintainers if that's a concern.
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# Copyright (C) 2021 Intel Corporation
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