fix(sidebar): expand when menu with children clicked

[yggg]

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• I read and followed the CONTRIBUTING.md guide.
• I read and followed the New Feature Checklist guide.

Short description of what this resolves:

[codecov]

Codecov Report

Merging #1750 into master will increase coverage by 0.49%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1750      +/-   ##
==========================================
+ Coverage   83.42%   83.91%   +0.49%     
==========================================
  Files         232      232              
  Lines        7564     7567       +3     
  Branches      664      665       +1     
==========================================
+ Hits         6310     6350      +40     
+ Misses       1061     1023      -38     
- Partials      193      194       +1

Impacted Files	Coverage Δ
...work/theme/components/sidebar/sidebar.component.ts	54.34% <100%> (+20.27%)	⬆️
.../framework/theme/components/menu/menu.component.ts	76.42% <0%> (+3.25%)	⬆️
...amework/theme/components/sidebar/sidebar.module.ts	100% <0%> (+10%)	⬆️
...mework/theme/components/sidebar/sidebar.service.ts	80% <0%> (+30%)	⬆️