Fix negated property

[cih9088]

Summary

Fixed wrong behaviour of is_encrypted property.

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

[vinnamkim]

LGTM.

[bonhunko]

LGTM!

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (8270e64) 78.90% compared to head (bd7f4a8) 78.90%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #907   +/-   ##
========================================
  Coverage    78.90%   78.90%           
========================================
  Files          211      211           
  Lines        25059    25059           
  Branches      5031     5031           
========================================
  Hits         19774    19774           
  Misses        4152     4152           
  Partials      1133     1133           

Flag	Coverage Δ
macos-11_Python-3.8	77.89% <0.00%> (ø)
ubuntu-20.04_Python-3.8	?
windows-2019_Python-3.8	78.84% <0.00%> (ø)

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

Impacted Files	Coverage Δ
datumaro/components/media.py	83.46% <0.00%> (ø)

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