test: fix invalid argument order in test-http-expect-continue.js

`assert.strictEqual` expects arguments in the following order:

actual, expected[, message]

PR-URL: #24138
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>

Author: mroderick

test/parallel/test-http-expect-continue.js

@@ -67,7 +67,7 @@ server.on('listening', common.mustCall(() => {
   }));
   req.on('response', common.mustCall((res) => {
     assert.ok(got_continue, 'Full response received before 100 Continue');
-    assert.strictEqual(200, res.statusCode,
+    assert.strictEqual(res.statusCode, 200,
                        `Final status code was ${res.statusCode}, not 200.`);
     res.setEncoding('utf8');
     res.on('data', function(chunk) { body += chunk; });