Fixes a typo in the asNestedTest() path rendering logic causing #2156 (#2157)

Author: ir0nCr055

src/schema.ts

@@ -546,7 +546,7 @@ export default abstract class Schema<
       [isIndex ? 'index' : 'key']: k,
       path:
         isIndex || k.includes('.')
-          ? `${parentPath || ''}[${value ? k : `"${k}"`}]`
+          ? `${parentPath || ''}[${isIndex ? k : `"${k}"`}]`
           : (parentPath ? `${parentPath}.` : '') + key,
     };