test: changed buffer-zero output

Added interpolated strings to display the error value

PR-URL: #15926
Reviewed-By: Ruben Bridgewater <[email protected]>

test/parallel/test-buffer-zero-fill-reset.js

@@ -15,5 +15,5 @@ function testUint8Array(ui) {
 for (let i = 0; i < 100; i++) {
   Buffer.alloc(0);
   const ui = new Uint8Array(65);
-  assert.ok(testUint8Array(ui), 'Uint8Array is not zero-filled');
+  assert.ok(testUint8Array(ui), `Uint8Array is not zero-filled: ${ui}`);
 }