joinmarket: 0.9.4 -> 0.9.5

Notes
- We can no longer test for `unknown error in JSON-RPC`. `jm-ob-watcher`
  now simply outputs `Starting ob-watcher`. Tested working on
  https://nixbitcoin.org/orderbook.
- Removed Agora IRC server since it is offline semi-permanently. Should
  probably also be removed upstream.
- Includes patch for
  https://github.com/JoinMarket-Org/joinmarket-clientserver/issues/1193

test/tests.nix

@@ -108,10 +108,6 @@ let
         txfee = 200;
       };
 
-      # Disable restarting joinmarket-ob-watcher because it always fails
-      # on non-synced mainnet nodes
-      systemd.services.joinmarket-ob-watcher.serviceConfig.Restart = mkForce "no";
-
       tests.nodeinfo = config.nix-bitcoin.nodeinfo.enable;
 
       tests.backups = cfg.backups.enable;