docs: refresh USB Creator setup screenshots (#528)

Automated refresh from the passing USB Creator journey
43ccce05222f963ae90fa7c1e7ccd7be694dae25-32096352015. Every image was
accepted only after the full virtual USB write and filesystem
verification passed, and the docs importer revalidated each SHA-256
digest.

Co-authored-by: unraid-docs-automation <actions@users.noreply.github.com>

Author: unraid-bot