Simplify ContactsParser

Co-authored-by: Fedor Indutny <79877362+indutny-signal@users.noreply.github.com>

ts/test-node/util/DelimitedStream_test.node.ts

@@ -114,7 +114,7 @@ describe('DelimitedStream', () => {
         new DelimitedStream(),
         collect(out)
       ),
-      'Unfinished data'
+      'Unfinished frame'
     );
   });