minor code styling fix

minor code styling fix

diff --git a/plugin.rb b/plugin.rb
index 0ecfa54..7782002 100644
--- a/plugin.rb
+++ b/plugin.rb
@@ -128,7 +128,7 @@ after_initialize do
     return if self.is_first_post?
 
     op = self&.topic&.first_post
-    if op && op&.custom_fields
+    if op&.custom_fields
       return if !op.custom_fields[DiscourseCalendar::CALENDAR_CUSTOM_FIELD]
     end

GitHub sha: 58ccb7f7