fix: remove key from data before validating

[pablo-abc]

Fixes #272

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Name	Status	Preview	Updated (UTC)
felte-docs	✅ Ready (Inspect)	Visit Preview	Jan 23, 2024 10:49pm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9e889fb) 99.64% compared to head (e66d5fe) 99.64%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #285   +/-   ##
=======================================
  Coverage   99.64%   99.64%           
=======================================
  Files         101      101           
  Lines        6976     6980    +4     
  Branches     1168     1168           
=======================================
+ Hits         6951     6955    +4     
  Misses         24       24           
  Partials        1        1           

Files	Coverage Δ
packages/core/src/default-submit-handler.ts	100.00% <100.00%> (ø)
packages/core/src/stores.ts	100.00% <100.00%> (ø)

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