fixed children alignment issue

[shreekeshmurkar]

Fixed following issue of children content alignment: https://github.com/Hacker0x01/react-datepicker/issues/3654

Before fix:

After fix:

[shreekeshmurkar]

@martijnrusschen Please review

[shreekeshmurkar]

Please review

[codecov[bot]]

Codecov Report

Merging #3656 (ee5adca) into master (1d84d31) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3656   +/-   ##
=======================================
  Coverage   93.34%   93.35%           
=======================================
  Files          20       20           
  Lines        1352     1354    +2     
  Branches      377      378    +1     
=======================================
+ Hits         1262     1264    +2     
  Misses         27       27           
  Partials       63       63           

Impacted Files	Coverage Δ
src/calendar.jsx	92.91% <100.00%> (+0.05%)	:arrow_up:

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[shreekeshmurkar]

@martijnrusschen Please review