test: fix arguments order in assert.strictEqual

In the test test/parallel/test-http-client-upload.js test the
actual and expected arguments in assert.strictEqual() calls
were in the wrong order. Switched them around so the returned
value by the function is the first argument and the literal
value is the second argument.

PR-URL: https://github.com/nodejs/node/pull/24143


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