chore: correct null check message to corresponding field

[domreuter]

What this PR changes/adds

This PR corrects the null check error message for the providerId within the EDREntry.

Why it does that

Wrong validation message was given for the providerId field.

Linked Issue(s)

Closes #4250

[wolf4ood]

Just the formatting and it should be good

Thanks

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 6.03%. Comparing base (7f20ba5) to head (bb81a28).
Report is 296 commits behind head on main.

❗ Current head bb81a28 differs from pull request most recent head a3665a5

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Additional details and impacted files

@@             Coverage Diff              @@
##               main   #4251       +/-   ##
============================================
- Coverage     71.74%   6.03%   -65.71%     
- Complexity        0     394      +394     
============================================
  Files           919    1046      +127     
  Lines         18457   20980     +2523     
  Branches       1037    1169      +132     
============================================
- Hits          13242    1267    -11975     
- Misses         4756   19692    +14936     
+ Partials        459      21      -438     

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[wolf4ood]

Thanks!