test: removing unnecessary parameter from assert call

Removed unnecessary parameter from assert call in
test/parallel/test-stream2-basic.js.

Fixes: #21305

PR-URL: #21307
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ujjwal Sharma <usharma1998@gmail.com>

test/parallel/test-stream2-basic.js

@@ -212,10 +212,10 @@ class TestWriter extends EE {
                    'xxxxx' ];
 
   w[0].on('end', common.mustCall(function(received) {
-    assert.deepStrictEqual(received, expect, 'first');
+    assert.deepStrictEqual(received, expect);
   }));
   w[1].on('end', common.mustCall(function(received) {
-    assert.deepStrictEqual(received, expect, 'second');
+    assert.deepStrictEqual(received, expect);
   }));
 
   r.pipe(w[0]);