Fix password handling for in-mem Redis

[SpecLad]

Motivation and context

The PASSWORD setting is not a URL, so it should not be URL-encoded.

How has this been tested?

Manual testing.

Checklist

• I submit my changes into the develop branch
• I have created a changelog fragment
• [ ] I have updated the documentation accordingly
• [ ] I have added tests to cover my changes
• [ ] I have linked related issues (see 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.

[codecov]

Codecov Report

Merging #7577 (4b006f2) into develop (bfb902f) will increase coverage by 0.01%.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7577      +/-   ##
===========================================
+ Coverage    83.53%   83.54%   +0.01%     
===========================================
  Files          372      372              
  Lines        39700    39700              
  Branches      3729     3729              
===========================================
+ Hits         33162    33169       +7     
+ Misses        6538     6531       -7     

Components	Coverage Δ
cvat-ui	79.45% <ø> (+0.03%)	⬆️
cvat-server	87.32% <ø> (+<0.01%)	⬆️

[nmanovic]

LGTM