Core/Mail: Load mails at login instead of on demand when queried by packets (logging in always sends one of the packets that cause mail loading anyway)

Port From (https://github.com/TrinityCore/TrinityCore/commit/a9b4f9aca0d0b90e59e0ed26e9bb4cce7d0ceeab)

Source/Game/Handlers/MailHandler.cs

@@ -568,10 +568,6 @@ namespace Game
 
             Player player = GetPlayer();
 
-            //load players mails, and mailed items
-            if (!player.m_mailsLoaded)
-                player._LoadMail();
-
             var mails = player.GetMails();
 
             MailListResult response = new();
@@ -658,9 +654,6 @@ namespace Game
         {
             MailQueryNextTimeResult result = new();
 
-            if (!GetPlayer().m_mailsLoaded)
-                GetPlayer()._LoadMail();
-
             if (GetPlayer().unReadMails > 0)
             {
                 result.NextMailTime = 0.0f;