fix(datepicker): add a custom class to set the header padding

[bastienmoulia]

fix #4608

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8b5768b) 89.92% compared to head (3d30b4b) 89.92%.
Report is 19 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4611      +/-   ##
==========================================
- Coverage   89.92%   89.92%   -0.01%     
==========================================
  Files         118      118              
  Lines        3742     3741       -1     
  Branches      734      734              
==========================================
- Hits         3365     3364       -1     
  Misses        341      341              
  Partials       36       36              

Flag	Coverage Δ
e2e	∅ <ø> (∅)
unit	89.92% <ø> (-0.01%)	⬇️

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Files	Coverage Δ
src/dropdown/dropdown.module.ts	100.00% <ø> (ø)
src/dropdown/dropdown.ts	59.34% <ø> (-0.23%)	⬇️
src/index.ts	100.00% <ø> (ø)

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[maxokorokov]

Thanks, LGTM!
It's been there for quite a while actually!