UX: calendar_enabled should be in discourse_calendar settings

UX: calendar_enabled should be in discourse_calendar settings

diff --git a/config/settings.yml b/config/settings.yml
index 8802067..a2003b1 100644
--- a/config/settings.yml
+++ b/config/settings.yml
@@ -1,8 +1,7 @@
-plugins:
+discourse_calendar:
   calendar_enabled:
     default: false
     client: true
-discourse_calendar:
   holiday_calendar_topic_id:
     default: ""
     client: true

GitHub sha: ee578723