fix(module:table): resolve leak within the nz-table-fixed-row

[arturovt]

PR Checklist

• The commit message follows our guidelines: https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/CONTRIBUTING.md#commit

PR Type

What kind of change does this PR introduce?

[x] Bugfix

What is the current behavior?

The hostWidth$ subject keeps the NzTableFixedRowComponent.hostWidth$ within its observers property until it unsubscribes.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

[zorro-bot]

This preview will be available after the AzureCI is passed.

[codecov]

Codecov Report

Merging #7034 (3c3e56a) into master (b18c050) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #7034      +/-   ##
==========================================
- Coverage   89.52%   89.51%   -0.02%     
==========================================
  Files         489      489              
  Lines       15768    15768              
  Branches     2573     2433     -140     
==========================================
- Hits        14117    14114       -3     
- Misses       1011     1012       +1     
- Partials      640      642       +2     

Impacted Files	Coverage Δ
...nents/table/src/table/table-fixed-row.component.ts	93.75% <100.00%> (ø)
components/core/util/text-measure.ts	89.47% <0.00%> (-1.76%)	⬇️
components/time-picker/time-holder.ts	95.78% <0.00%> (-1.06%)	⬇️

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[hsuanxyz]

LGTM