Adjusted RODEX mail return and delete timers

* Adjusted from 14 -> 15 days.

conf/char_athena.conf

@@ -267,13 +267,13 @@ clan_remove_inactive_days: 14
 // After how many days should mails be returned to their sender?
 // 0: never return them
 // X: return them after X days
-// Default: 14
-mail_return_days: 14
+// Default: 15
+mail_return_days: 15
 
 // How many days after a mail was returned to it's sender should it be deleted completely?
 // 0: never delete them
 // X: delete them X days after they were returned
-// Default: 14
-mail_delete_days: 14
+// Default: 15
+mail_delete_days: 15
 
 import: conf/import/char_conf.txt