mod_http_oauth2: Always show early errors to user Before having validated the client_id, communicating an error back to the client via redirect would make this an open redirect, so we may just as well skip past that logic, and especially the warning log message.

This module produces more detailed HTTP logs for Prosodys built-in HTTP
server. The format is similar to that of Apache and go into Prosodys
normal logs at the `info` level.