ci: Fix skipping codecov2 upload for scheduled

[philipphofmann]

Scheduled runs try to upload coverage. I guess that's because the ${{ wasn't put at the beginning of the if statement in the yml.

https://github.com/getsentry/sentry-cocoa/actions/runs/4922793243/jobs/8793926172

[codecov]

Codecov Report

Merging #3015 (00d74cb) into main (ba4d16f) will decrease coverage by 0.370%.
The diff coverage is n/a.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #3015       +/-   ##
=============================================
- Coverage   88.624%   88.254%   -0.370%     
=============================================
  Files          495       495               
  Lines        56760     53256     -3504     
  Branches     19243     19129      -114     
=============================================
- Hits         50303     47001     -3302     
+ Misses        5617      5285      -332     
- Partials       840       970      +130     

see 247 files with indirect coverage changes

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