fix config button did not work when path of rclone.conf was specified

[fsaimon]

> /tmp/rclone_config.command ; exit;
Error: unknown command "config--config" for "rclone"
Run 'rclone --help' for usage.
Fatal error: unknown command "config--config" for "rclone"

File /tmp/rclone_config.command

#!/bin/sh
/usr/local/bin/rclone config--config /path/to/conf