fs/config: don't print errors about --config if supplied - fixes #2397
fs/config: don't print errors about --config if supplied - fixes #2397

Before this change if the rclone was running in an environment which
couldn't find the HOME directory, it would print a warning about
supplying a --config flag even if the user had done so.

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