fix(module:date-picker): fix date display of the end part is not as e…

[wilsoncook]

…xpected

close #1693

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Application (the showcase website) / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: #1693

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[ ] No

Other information

[codecov]

Codecov Report

Merging #1709 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1709      +/-   ##
==========================================
+ Coverage   96.05%   96.05%   +<.01%     
==========================================
  Files         466      466              
  Lines       11135    11136       +1     
  Branches     1453     1454       +1     
==========================================
+ Hits        10696    10697       +1     
  Misses        127      127              
  Partials      312      312

Impacted Files	Coverage Δ
...te-picker/lib/popups/date-range-popup.component.ts	95.19% <100%> (+0.02%)	⬆️

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