Fix deleteField inside of an array

[Christian24]

This should fix deleting a field that is inside of an array. It should close #509

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[crutchcorn]

This now fixes #511 as well.

[crutchcorn]

Great work on this! Thank you!

[codecov-commenter]

Codecov Report

Attention: 26 lines in your changes are missing coverage. Please review.

Comparison is base (c2f9957) 84.55% compared to head (b41b2ef) 91.65%.
Report is 56 commits behind head on main.

Files	Patch %	Lines
packages/form-core/src/FormApi.ts	89.55%	12 Missing and 2 partials ⚠️
packages/form-core/src/FieldApi.ts	92.85%	5 Missing ⚠️
packages/form-core/src/utils.ts	90.00%	2 Missing ⚠️
packages/react-form/src/useField.tsx	71.42%	2 Missing ⚠️
packages/solid-form/src/createField.tsx	96.55%	1 Missing ⚠️
packages/solid-form/src/createForm.tsx	92.30%	1 Missing ⚠️
packages/solid-form/src/formContext.ts	83.33%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #510      +/-   ##
==========================================
+ Coverage   84.55%   91.65%   +7.09%     
==========================================
  Files           9       21      +12     
  Lines         395      671     +276     
  Branches      109      184      +75     
==========================================
+ Hits          334      615     +281     
+ Misses         52       49       -3     
+ Partials        9        7       -2     

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