Core/Player: apply heirloom stat modifiers before maxing out health/power at level up.

This allows characters with heirlooms to have their health/mana maxed out at level up, instead of having some missing due to the increased stat modifiers from heirlooms.

src/server/game/Entities/Player/Player.cpp

@@ -2794,6 +2794,8 @@ void Player::GiveLevel(uint8 level)
     if (sWorld->getBoolConfig(CONFIG_ALWAYS_MAXSKILL)) // Max weapon skill when leveling up
         UpdateSkillsToMaxSkillsForLevel();
 
+    _ApplyAllLevelScaleItemMods(true);
+
     // set current level health and mana/energy to maximum after applying all mods.
     SetFullHealth();
     SetPower(POWER_MANA, GetMaxPower(POWER_MANA));
@@ -2803,8 +2805,6 @@ void Player::GiveLevel(uint8 level)
     SetPower(POWER_FOCUS, 0);
     SetPower(POWER_HAPPINESS, 0);
 
-    _ApplyAllLevelScaleItemMods(true);
-
     // update level to hunter/summon pet
     if (Pet* pet = GetPet())
         pet->SynchronizeLevelWithOwner();