fix: return FieldApi directly

Author: 43081j

packages/svelte-form/src/createField.svelte.ts

@@ -41,7 +41,7 @@ export type CreateField<
     >,
     'form'
   >,
-) => () => FieldApi<
+) => FieldApi<
   TParentData,
   TName,
   TFieldValidator,

packages/svelte-form/src/createForm.svelte.ts

@@ -29,6 +29,7 @@ export function createForm<
   // No clue right now how we do that
   extendedApi.Field = Field
   extendedApi.createField = (props) =>
+    // TODO (43081j): type is excessively deep.. no clue why yet
     createField(() => {
       return { ...props(), form: api }
     })