fix(NcActions): check slot content only during the rendering

[ShGKme]

☑️ Resolves

• Alternative of https://github.com/nextcloud-libraries/nextcloud-vue/pull/5196
• Fix #…

🖼️ Screenshots

🏚️ Before	🏡 After
B	A

🚧 Tasks

• [ ] ...

🏁 Checklist

• [ ] ⛑️ Tests are included or are not applicable
• [ ] 📘 Component documentation has been extended, updated or is not applicable

[codecov[bot]]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (83d844d) 39.34% compared to head (eee1852) 39.39%.

Files	Patch %	Lines
src/components/NcActionLink/NcActionLink.vue	0.00%	2 Missing :warning:
src/components/NcActions/NcActions.vue	33.33%	0 Missing and 2 partials :warning:
src/components/NcActionRouter/NcActionRouter.vue	0.00%	1 Missing :warning:
src/mixins/actionGlobal.js	85.71%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5197      +/-   ##
==========================================
+ Coverage   39.34%   39.39%   +0.04%     
==========================================
  Files         139      139              
  Lines        3688     3691       +3     
  Branches      810      810              
==========================================
+ Hits         1451     1454       +3     
  Misses       2021     2021              
  Partials      216      216              

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