fix(module:autocomplete): fix the wrong value of internal nz-auto-option

[HyperLife1119]

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?

Fix the problem that when the dataSource is an object array, the value of the internal nz-auto-option is set incorrectly.

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[zorro-bot]

This preview will be available after the AzureCI is passed.

[codecov]

Codecov Report

Merging #7907 (2c18761) into master (169181c) will decrease coverage by 0.15%.
The diff coverage is 85.08%.

❗ Current head 2c18761 differs from pull request most recent head 17fa273. Consider uploading reports for the commit 17fa273 to get more accurate results

@@            Coverage Diff             @@
##           master    #7907      +/-   ##
==========================================
- Coverage   91.80%   91.65%   -0.15%     
==========================================
  Files         509      515       +6     
  Lines       17452    17647     +195     
  Branches     2684     2791     +107     
==========================================
+ Hits        16022    16175     +153     
- Misses       1136     1175      +39     
- Partials      294      297       +3     

Impacted Files	Coverage Δ
components/modal/modal-footer.component.ts	100.00% <ø> (ø)
components/modal/modal-types.ts	100.00% <ø> (ø)
components/modal/modal.component.ts	95.83% <ø> (ø)
components/modal/modal.service.ts	95.87% <ø> (-0.09%)	⬇️
components/modal/utils.ts	100.00% <ø> (ø)
components/resizable/resizable.directive.ts	95.32% <0.00%> (ø)
components/table/src/table.module.ts	100.00% <ø> (ø)
components/tree/tree-node.component.ts	91.93% <0.00%> (-2.06%)	⬇️
components/qr-code/qrcode.ts	58.06% <72.00%> (+6.90%)	⬆️
components/form/form-label.component.ts	79.54% <75.00%> (-1.02%)	⬇️
... and 17 more

... and 4 files with indirect coverage changes

[HyperLife1119]

The PR is ready. @hsuanxyz

[hsuanxyz]

LGTM

[HyperLife1119]

When can we merge it? @OriginRing @simplejason