app: drop --mkpath for compatibility with old remote rsyncs

rsync forwards --mkpath to the remote side when sending, so a remote
rsync older than 3.2.3 (notably stock macOS, whose openrsync is
"rsync 2.6.9 compatible") rejects every sync with "unrecognized
option '--mkpath'".

rsync creates the final component of the destination path on its own,
so flat remote paths keep working everywhere, including the documented
rrsync setup whose root is pre-created. Only a nested remote path with
missing parents now needs a one-time mkdir -p on the server; the log
shows rsync's error when it is missing.

Reported-by: jsvk
Link: https://codeberg.org/0xlena/rsend/pulls/1

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