test: remove third argument from assert.strictEqual()

`test/parallel/test-util-inspect.js` has a call to
`assert.strictEqual()` that receives three arguments.
The third argument is a string literal. Unfortunately,
calling assert.strictEqual() this way means that if
there is an AssertionError, the value of the variables
pos and npos are not reported.
This PR removes this argument.

PR-URL: #22371
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>
Reviewed-By: Jon Moss <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: George Adams <[email protected]>

test/parallel/test-util-inspect.js

@@ -979,7 +979,7 @@ if (typeof Symbol !== 'undefined') {
       const npos = line.search(numRE);
       if (npos !== -1) {
         if (pos !== undefined) {
-          assert.strictEqual(pos, npos, 'container items not aligned');
+          assert.strictEqual(pos, npos);
         }
         pos = npos;
       }