fix(module:tooptip): fix setTitle proxy to nzTitle

[wzhudev]

close #2695, #2800

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: #2695, #2800

What is the new behavior?

setTitle is proxy to nzTitle, so nzTitle of nzTooltipCopmonent is updated.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

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[codecov]

Codecov Report

Merging #2698 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2698      +/-   ##
==========================================
+ Coverage   95.51%   95.53%   +0.01%     
==========================================
  Files         518      517       -1     
  Lines       12292    12264      -28     
  Branches     1697     1692       -5     
==========================================
- Hits        11741    11716      -25     
+ Misses        191      189       -2     
+ Partials      360      359       -1

Impacted Files	Coverage Δ
components/tooltip/nz-tooltip.component.ts	95.65% <100%> (+0.19%)	⬆️
components/popover/nz-popover.component.ts	100% <100%> (ø)	⬆️
components/tooltip/nz-tooltip.directive.ts	96.55% <100%> (+0.12%)	⬆️
components/core/util/convert.ts	82.6% <0%> (-3.11%)	⬇️
components/icon/public-api.ts
components/icon/index.ts
components/icon/nz-icon-test.module.ts	100% <0%> (ø)
components/icon/nz-icon.service.ts	98.27% <0%> (+0.06%)	⬆️
components/pagination/nz-pagination.component.ts	100% <0%> (+0.69%)	⬆️
components/icon/nz-icon.directive.ts	96.29% <0%> (+3.7%)	⬆️

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[CarterLi]

module:tooltip

[vthinkxie]

LGTM