Core/Dungeon Finder: Fix instances unlock after level change

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

@@ -2968,11 +2968,10 @@ void Player::GiveXP(uint32 xp, Unit *victim, float group_rate)
 // Current player experience not update (must be update by caller)
 void Player::GiveLevel(uint8 level)
 {
-    if (level == getLevel())
+    uint8 oldLevel = getLevel();
+    if (level == oldLevel)
         return;
 
-    sScriptMgr->OnPlayerLevelChanged(this, level);
-
     PlayerLevelInfo info;
     sObjectMgr->GetPlayerLevelInfo(getRace(), getClass(), level, &info);
 
@@ -3048,6 +3047,8 @@ void Player::GiveLevel(uint8 level)
     }
 
     GetAchievementMgr().UpdateAchievementCriteria(ACHIEVEMENT_CRITERIA_TYPE_REACH_LEVEL);
+
+    sScriptMgr->OnPlayerLevelChanged(this, oldLevel);
 }
 
 void Player::InitTalentForLevel()