fix(module:onboarding): fix closed mask when click target element

[cipchk]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ng-alain/delon/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: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[ ] No

Other information

[codecov]

Codecov Report

Merging #1202 (34239ae) into master (7bf3563) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1202   +/-   ##
=======================================
  Coverage   96.32%   96.32%           
=======================================
  Files         268      268           
  Lines        8053     8056    +3     
  Branches     1475     1475           
=======================================
+ Hits         7757     7760    +3     
  Misses        135      135           
  Partials      161      161           

Impacted Files	Coverage Δ
packages/abc/onboarding/onboarding.component.ts	95.94% <100.00%> (+0.17%)	⬆️

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