fix(abc:st): fix invalid default value of date type

[cipchk]

• close 表格列表的“type：‘date’时，default默认值不起作用” ng-alain#1471

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ng-alain/delon/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: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[codecov-io]

Codecov Report

Merging #765 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #765      +/-   ##
==========================================
- Coverage   98.83%   98.83%   -0.01%     
==========================================
  Files         265      265              
  Lines        7798     7797       -1     
  Branches     1179     1180       +1     
==========================================
- Hits         7707     7706       -1     
  Misses         30       30              
  Partials       61       61

Impacted Files	Coverage Δ
packages/abc/table/table-data-source.ts	100% <100%> (ø)	⬆️

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