fix(demo): fix left sidebar is not fully visible on small screens

[EvilAlexei]

Changed buttons for bootstrap versions to prevent height changes on small screens

Closes #3383

PR Checklist

Before creating new PR, please take a look at checklist below to make sure that you've done everything that needs to be done before we can merge it.

• read and followed the CONTRIBUTING.md guide.
• built and tested the changes locally.
• added/updated demos.

[codecov]

Codecov Report

Merging #3780 into development will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #3780   +/-   ##
============================================
  Coverage        72.23%   72.23%           
============================================
  Files              253      253           
  Lines             8238     8238           
  Branches          1565     1565           
============================================
  Hits              5951     5951           
  Misses            1866     1866           
  Partials           421      421

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[YevheniiaMazur]

Tested, looks good