http: allow both ticket and username/password auth

http: allow both ticket and username/password auth

When the default account has not all privileges, downloading the
playlist anonymously can result in URLs that can't be accessed with the
ticket in the URLs. The client then prompts for username and password,
you enter the correct credentials, but the credentials are not accepted.
Allow username and password in case ticket authorization fails.

Signed-off-by: Sven Wegener <sven.wegener@stealer.net>