Add draupnir as valid prefix to resolve a bug

Current draupnir does not listen to its name. This config change fixes this bug. This bodge is able to be removed once this is fixed upstream.

roles/custom/matrix-bot-draupnir/templates/production.yaml.j2

@@ -146,6 +146,7 @@ commands:
   # Any additional bot prefixes that draupnir will listen to. i.e. adding `mod` will allow `!mod help`.
   additionalPrefixes:
     - "draupnir_bot"
+    - "draupnir"
 
   # Whether or not commands with a wildcard (*) will require an additional `--force` argument
   # in the command to be able to be submitted.