lower level triggerSubMenuAction wins over upper level triggerSubMenuAction

[llambanna]

to cater for scenario where top level items are click and sub menus are hover - similar to google docs menu UX

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.53%. Comparing base (8085da9) to head (af68058).
⚠️ Report is 204 commits behind head on master.

Files with missing lines	Patch %	Lines
src/SubPopupMenu.tsx	33.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@ Coverage Diff @@## master #368 +/- ##
==========================================
- Coverage 95.73% 95.53% -0.21% 
==========================================
Files 11 11 Lines 915 918 +3 Branches 271 274 +3 ==========================================
+ Hits 876 877 +1 - Misses 39 40 +1 - Partials 0 1 +1 

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[afc163]

Test case is needed.