fix: make bridge logging ERROR only

Decryption happens on the bridges (between systems) so in order to stop
plaintext logging of chat messages, we default to ERROR. If people need
more, they can submit changes for customisation.

discord_bridge.yaml.tmpl

@@ -50,7 +50,7 @@ auth:
 
 logging:
   # What level should the logger output to the console at.
-  console: "warn" #silly, verbose, info, http, warn, error, silent
+  console: "error" #silly, verbose, info, http, warn, error, silent
   lineDateFormat: "MMM-D HH:mm:ss.SSS" # This is in moment.js format
   files:
     - file: "debug.log"