Fix using supplied decoder for encrypted values

[Supereg]

Fix using supplied decoder for encrypted values

♻️ Current situation & Problem

There was an issue in the read implementation where the supplied decoder was only used if the element wasn't encrypted. The other code path was forgotten to be updated in #21.
This issue is fixed by this PR.

⚙️ Release Notes

• Fixed an issue where the supplied decoder wasn't used.

📚 Documentation

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✅ Testing

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📝 Code of Conduct & Contributing Guidelines

By submitting creating this pull request, you agree to follow our Code of Conduct and Contributing Guidelines:

• I agree to follow the Code of Conduct and Contributing Guidelines.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.06%. Comparing base (52bd5cb) to head (f58863b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #23   +/-   ##
=======================================
  Coverage   92.06%   92.06%           
=======================================
  Files           6        6           
  Lines         453      453           
=======================================
  Hits          417      417           
  Misses         36       36           

Files	Coverage Δ
Sources/SpeziLocalStorage/LocalStorage.swift	89.43% <100.00%> (ø)

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