Fixed reversed warn condition for bindflags
Fixed reversed warn condition for bindflags

Summary: warn logic was reversed in Configurable::as coercion helper.

Reviewed By: Feng23

Differential Revision: D15435359

fbshipit-source-id: 3d92eb6843c74a737f4689e420af2a6e6a8522ad

facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex