test: remove string literal message from assertion

Remove string literal message in assert.strictEqual() call in napi test
testFinalizer.js.

Backport-PR-URL: #22912
PR-URL: #22849
Reviewed-By: Teddy Katz <teddy.katz@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: Trott

test/addons-napi/test_general/testFinalizer.js

@@ -29,5 +29,4 @@ test_general.wrap(finalizeAndWrap);
 test_general.addFinalizerOnly(finalizeAndWrap, common.mustCall());
 finalizeAndWrap = null;
 global.gc();
-assert.strictEqual(test_general.derefItemWasCalled(), true,
-                   'finalize callback was called');
+assert.strictEqual(test_general.derefItemWasCalled(), true);