swift: Fix extra HEAD transaction when uploading a new file - fixes #2053
swift: Fix extra HEAD transaction when uploading a new file - fixes #2053

Also don't keep the swift.Headers as a pointer to a map, just use the map

B4dM4n/rclone,yonjah/rclone,olihey/rclone,B4dM4n/rclone,B4dM4n/rclone,seuffert/rclone,seuffert/rclone,yonjah/rclone,ncw/rclone,ncw/rclone,seuffert/rclone,olihey/rclone,olihey/rclone,seuffert/rclone,ncw/rclone,olihey/rclone,yonjah/rclone,B4dM4n/rclone,ncw/rclone,yonjah/rclone