Shorten the Menu constructor a tiny bit

[Snuffleupagus]

The fallback path used when the menuItems aren't provided/correct can be simplified, since the manual loop isn't necessary.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.02%. Comparing base (4806d82) to head (1e2c571).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #21700      +/-   ##
==========================================
- Coverage   90.03%   90.02%   -0.02%     
==========================================
  Files         264      264              
  Lines       66894    66890       -4     
==========================================
- Hits        60229    60218      -11     
- Misses       6665     6672       +7     

Flag	Coverage Δ
browsertest	66.52% <ø> (+<0.01%)	⬆️
integrationtest	69.34% <100.00%> (-0.03%)	⬇️
unittest	57.88% <ø> (ø)
unittestcli	56.62% <ø> (-0.01%)	⬇️

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[timvandermeij]

Looks good; thanks!