UHF-9135: Simplify mobile fallback menu

[tuutti]

UHF-9135

How to install

• composer require drupal/helfi_navigation:dev-UHF-9135
• drush cr

How to test

• todo

[codecov-commenter]

Codecov Report

Merging #48 (41ade49) into main (ed63e6e) will increase coverage by 15.33%.
Report is 4 commits behind head on main.
The diff coverage is 63.04%.

❗ Current head 41ade49 differs from pull request most recent head f03cb15. Consider uploading reports for the commit f03cb15 to get more accurate results

@@              Coverage Diff              @@
##               main      #48       +/-   ##
=============================================
+ Coverage     70.83%   86.17%   +15.33%     
+ Complexity      177      162       -15     
=============================================
  Files            20       20               
  Lines           679      622       -57     
=============================================
+ Hits            481      536       +55     
+ Misses          198       86      -112     

Files	Coverage Δ
src/ApiManager.php	100.00% <ø> (ø)
src/MainMenuManager.php	100.00% <ø> (ø)
src/Plugin/rest/resource/GlobalMobileMenu.php	93.33% <ø> (ø)
src/Menu/MenuTreeBuilder.php	95.28% <50.00%> (-0.88%)	⬇️
src/Plugin/Block/MobileMenuFallbackBlock.php	79.01% <63.63%> (+71.86%)	⬆️

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[Arkkimaagi]

Code seems to work as it should, this fixes the bug. I'm unable to check the code quality tho as I'm not too familiar with it.