test: Use strictEqual in test-tls-writewrap-leak

PR-URL: #9666
Reviewed-By: Myles Borins <[email protected]>
Reviewed-By: Gibson Fahnestock <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Sakthipriyan Vairamani <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>

test/parallel/test-tls-writewrap-leak.js

@@ -20,7 +20,7 @@ const server = net.createServer(common.mustCall((c) => {
   });
 
   c.write('hello', common.mustCall((err) => {
-    assert.equal(err.code, 'ECANCELED');
+    assert.strictEqual(err.code, 'ECANCELED');
     server.close();
   }));
 }));