sftp: fix hash check for names starting with "-" with relative --sftp-path-override

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With a relative path override such as `--sftp-path-override @.` (useful
on chrooted hosting where the SSH shell starts in the directory that
SFTP shows as "/"), a file in the root gets the shell path "-name".
`quoteOrEscapeShellPath` does not escape "-", so the hash command
became `md5sum -name`, which md5sum parses as an option. The hash then
failed and the transfer was reported as "corrupted on transfer".

Absolute shell paths always start with "/", so only relative overrides
were affected. Prefix such paths with "./".

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