Set autoload to false on CURLFile in HTTPSFuture

Summary: Fixes T6264, I assume this is correct after grepping through the codebase.

Test Plan: Reload in sandbox, eyeball text, not sure what else to do.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T6264

Differential Revision: https://secure.phabricator.com/D10650