fix(accordion): fix destroyOnHide behaviour Fixes #4541

[ValentinNelu]

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• read and followed the CONTRIBUTING.md and DEVELOPER.md guide.
• built and tested the changes locally.
• added/updated any applicable tests.
• added/updated any applicable API documentation.
• added/updated any applicable demos.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (9f0916e) 89.27% compared to head (6201dd1) 89.28%.
Report is 1 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4545   +/-   ##
=======================================
  Coverage   89.27%   89.28%           
=======================================
  Files         120      120           
  Lines        4300     4301    +1     
  Branches      820      821    +1     
=======================================
+ Hits         3839     3840    +1     
  Misses        419      419           
  Partials       42       42           

Flag	Coverage Δ
e2e	50.12% <0.00%> (-0.02%)	⬇️
unit	89.90% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
src/accordion/accordion.directive.ts	97.34% <100.00%> (+0.02%)	⬆️

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[maxokorokov]

LGTM, thanks!