remove trailing whitespaces ❤️

lib/unread.rb

@@ -11,8 +11,8 @@ class Unread
   def unread_posts
     return 0 if do_not_notify?(@topic_user.notification_level)
     result = ((@topic_user.seen_post_count||0) - (@topic_user.last_read_post_number||0))
-    result = 0 if result < 0   
-    result     
+    result = 0 if result < 0
+    result
   end
 
   def new_posts