fix(module: toast): called in ngOnInit will report an error

[shuizhongxiong]

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-mobile/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?

在生命周期ngOnInit里面调Toast轻提示会报错ERROR Error: ApplicationRef.tick is called recursively

Issue Number: 640

What is the new behavior?

不再报错

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[codecov]

Codecov Report

Merging #795 (2072166) into master (c10877a) will decrease coverage by 0.00%.
The diff coverage is 50.00%.

❗ Current head 2072166 differs from pull request most recent head 11822b6. Consider uploading reports for the commit 11822b6 to get more accurate results

@@            Coverage Diff             @@
##           master     #795      +/-   ##
==========================================
- Coverage   86.86%   86.86%   -0.01%     
==========================================
  Files         164      164              
  Lines        6679     6682       +3     
  Branches     1116     1117       +1     
==========================================
+ Hits         5802     5804       +2     
- Misses        429      430       +1     
  Partials      448      448              

Impacted Files	Coverage Δ
components/toast/toast.service.ts	86.30% <50.00%> (-2.28%)	⬇️
components/date-picker/date-picker.component.ts	75.45% <0.00%> (+0.20%)	⬆️

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