Use success_data_from_listsendpays to check if there are "complete"
sendpays instead of imposing the presence of "complete" sendpays as a
precondition for success_data_from_listsendpays.
Signed-off-by: Lagrang3 <lagrang3@protonmail.com>
Any file in this directory which is executable and whose name only
consists of alphanumeric characters, space, '.', '-' or '_' will be
automatically loaded when lightningd starts (unless suppressed with
commandline options).