test: fix the arguments order in assert.strictEqual

This change was initiated from the NodeConfEU session.

PR-URL: https://github.com/nodejs/node/pull/24226
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

test/parallel/test-fs-read-stream-fd-leak.js

@@ -37,8 +37,8 @@ function testLeak(endFn, callback) {
     }
 
     assert.strictEqual(
-      0,
       openCount,
+      0,
       `no leaked file descriptors using ${endFn}() (got ${openCount})`
     );