Fix SetError to Preserve Existing Errors elsewhere in the object

[SimonJTurner]

When calling setError, if a call was made to set an error on a descendant within a form (foo.bar.baz), then a later call was made to set an error on the ancestor (foo.bar), the previous error would be lost.

This was the run of pnpm test after the first commit, which only contained the test:

Following the update to setError, we make sure you don't lose the errors that are further down the tree by including them in the call to set. To be fair, one /could/ consider just spreading in the entire currentError, but by destructuring and omitting message and type we make sure that they get overwritten by the current error.

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[bluebill1049]

thanks for the contribution.