fix: 修复 NzModalRef 回调值丢失的问题

[dusdong]

NzModalRef，先 close(true) 再 destory()，会导致回调值丢失。 在 ng-zorro 8.x 版本中，不存在该问题

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PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
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What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

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[ ] No

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