test: rename handlewrap.hasref tests

`HandleWrap.isRefed()` was renamed to `hasRef()`. However, the filename
of related TCs has not been reflected.

Refs: f31a5ec34a

test/parallel/test-handle-wrap-isrefed.js → test/parallel/test-handle-wrap-hasref.js

@@ -133,4 +133,4 @@ const { kStateSymbol } = require('internal/dgram');
     (type) => type === 'Immediate').length, 1);
 }
 
-// See also test/pseudo-tty/test-handle-wrap-isrefed-tty.js
+// See also test/pseudo-tty/test-handle-wrap-hasref-tty.js

test/pseudo-tty/test-handle-wrap-isrefed-tty.js → test/pseudo-tty/test-handle-wrap-hasref-tty.js

@@ -1,7 +1,7 @@
 // Flags: --expose-internals --no-warnings
 'use strict';
 
-// See also test/parallel/test-handle-wrap-isrefed.js
+// See also test/parallel/test-handle-wrap-hasref.js
 
 const common = require('../common');
 const strictEqual = require('assert').strictEqual;