Core/Conf: Update MaxPlayerLevel to 80

Port From (https://github.com/TrinityCore/TrinityCore/commit/1580b4ef84f11c06dc6adab60c09f2791c0876c5)

Source/Framework/Constants/SharedConst.cs

@@ -20,7 +20,7 @@ namespace Framework.Constants
         public const int MaxHolidayDurations = 10;
         public const int MaxHolidayDates = 26;
         public const int MaxHolidayFlags = 10;
-        public const int DefaultMaxLevel = 70;
+        public const int DefaultMaxLevel = 80;
         public const int MaxLevel = 123;
         public const int StrongMaxLevel = 255;
         public const int MaxOverrideSpell = 10;

Source/WorldServer/WorldServer.conf.dist

@@ -870,9 +870,9 @@ SkipCinematics = 0
 #        Description: Maximum level that can be reached by players.
 #        Important:   Levels beyond 110 are not recommended at all.
 #        Range:       1-255
-#        Default:     70
+#        Default:     80
 
-MaxPlayerLevel = 70
+MaxPlayerLevel = 80
 
 #
 #    MinDualSpecLevel