fix(choice,tests): add value default value, fix test

Author: mdauner

src/components/Choice.svelte

@@ -8,7 +8,7 @@
   export let name;
   export let options;
   export let multiple = false;
-  export let value;
+  export let value = '';
 
   const { touchField, values, errors, touched, validateOnChange } = getContext(
     FORM

tests/Input/__snapshots__/Input.spec.js.snap

@@ -27,7 +27,7 @@ exports[`Input matches snapshot 1`] = `
 </div>
 `;
 
-exports[`Input passes props 1`] = `
+exports[`Input passes props to input 1`] = `
 <div>
   <form
     class="sveltejs-forms"