When duplicating a feed the passkey should be randomly generated and not cloned from the feed being duplicated

[jamesmacwhite]

When duplicating a feed the passkey value is copied from the original feed, as the purpose of the passkey is to be a unique key, it would be potentially better for security if this value is randomised, rather than being copied, otherwise you could have multiple feeds with the same passkey which reduces the security and purpose of the field.