benchmark: refactor deepequal-object

This is a minor refactor of benchmark/assert/deepequal-object.js to
reduce exceptions that need to be made for lint compliance.

PR-URL: #21030
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

benchmark/assert/deepequal-object.js

@@ -29,13 +29,15 @@ function main({ size, n, method }) {
   // TODO: Fix this "hack". `n` should not be manipulated.
   n = n / size;
 
+  if (!method)
+    method = 'deepEqual';
+
   const source = Array.apply(null, Array(size));
   const actual = createObj(source);
   const expected = createObj(source);
   const expectedWrong = createObj(source, '4');
 
-  // eslint-disable-next-line no-restricted-properties
-  const fn = method !== '' ? assert[method] : assert.deepEqual;
+  const fn = assert[method];
   const value2 = method.includes('not') ? expectedWrong : expected;
 
   bench.start();