Re-enable Agora IRC in configuration defaults

[kristapsk]

Up for discussion, of course. Historically it was disabled by default at one point, as it was unreliable back then. But, as I already mentioned in #997, haven't noticed any issues with it recently (for months).

[openoms]

ACK fb9f593

Tested successfully over Tor.
This is needed as hackint only shows a few orders now (users reporting on Telegram too).

An orderbook with hackint + agora:
http://526xpibebns6mehmmfqj5kpzl4shg4wa7sdwbnpsjqenfidbnn4m3lyd.onion

[AdamISZ]

(Just for clarification, apparently there is confusion: we currently have hackint and darkscience, but agreed on having a third default, there is essentially no harm in it and there are reports that hackint is unreliable.)

(Additional commentary for those wishing to understand better: if any 1 out of n configured IRC servers is not even reachable (or channel not join-able), we allow the bot to finish its startup sequence after a 60 second timeout. If there are dropped connections, we can auto-switch even during a transaction negotiation, but it depends on details and certainly there are scenarios where communications might fail. This is one of a couple reasons I'm very motivated to continue work on #1000 as soon as I can find the time and would ask others to join me in that, or any other solution, of course).

[AdamISZ]

tACK and merging.