fix#7824
Statements like rclone copy <somewhere> . will spontaneously miss
if . expands to a path with a Full Width replacement character.
This is due to the incorrect order in which
relative paths and decoding were handled in the original implementation.
The vfs use the hardcoded OS encoding when creating temp file,
but decode it with encoding for the local filesystem (--local-encoding)
when copying it to remote.
This caused failures when the filenames contained special characters.
The hardcoded OS encoding is now used uniformly.
URenkoandNick Craig-Wood