fix(menu)

[yggg]

Please read and mark the following check list before creating a pull request:

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

Short description of what this resolves:

Fixes: #620, #369, #532, #307, #444, #392, akveo/ngx-admin#1703, akveo/ngx-admin#1819

[codecov]

Codecov Report

Merging #621 into master will decrease coverage by 0.09%.
The diff coverage is 17.24%.

@@            Coverage Diff            @@
##           master     #621     +/-   ##
=========================================
- Coverage   72.81%   72.71%   -0.1%     
=========================================
  Files         153      153             
  Lines        4219     4222      +3     
  Branches      318      323      +5     
=========================================
- Hits         3072     3070      -2     
- Misses       1090     1095      +5     
  Partials       57       57

Impacted Files	Coverage Δ
.../framework/theme/components/menu/menu.component.ts	37.28% <40.9%> (+4.95%)	⬆️
...rc/framework/theme/components/menu/menu.service.ts	32.6% <9.23%> (-7.4%)	⬇️