s3: fix server side copy and set modtime on files with + in - fixes #2001
s3: fix server side copy and set modtime on files with + in - fixes #2001

This was broken in 64ea94c1a4e9d7a104b393a17d2e883593e20809 when
putting a work-around for Digital Ocean.  PathEscape has now been
adjusted so it works with both providers.

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