deploy: Remove (transfer none) from fd arg

GI complains.  And in general one needs to assume that file
descriptors aren't stolen.

src/libostree/ostree-sysroot-deploy.c

@@ -3046,7 +3046,7 @@ _ostree_sysroot_deserialize_deployment_from_variant (GVariant *v,
 /**
  * ostree_sysroot_stage_overlay_initrd:
  * @self: Sysroot
- * @fd: (transfer none): File descriptor to overlay initrd
+ * @fd: File descriptor to overlay initrd
  * @out_checksum: (out) (transfer full): Overlay initrd checksum
  * @cancellable: Cancellable
  * @error: Error