WebAuthn: Remove kWebAuthnRequireUpToDateJSONForRemoteDesktop feature

Bug: 40917116
Change-Id: I8e70577e2c3104fd61ce773bb11d1dcb65b65b91
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5483447


Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/main@{#1291983}