fix: initiallyCollapsed should work with hierarchical tree dataset

[ghiscoding]

The initiallyCollapsed option for Tree Data was working fine for a parent/child dataset but it wasn't working at all for a hierarchical (tree) dataset. This fixes it and it now works for both types

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commit: f1874bb

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (3498d89) to head (f1874bb).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2083   +/-   ##
=======================================
  Coverage   100.0%   100.0%           
=======================================
  Files         196      196           
  Lines       35845    35862   +17     
  Branches    10632    10638    +6     
=======================================
+ Hits        35845    35862   +17     

Flag	Coverage Δ
angular	100.0% <100.0%> (ø)
universal	100.0% <100.0%> (ø)

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