add walkthrough update when crossing PROTECTION_LEVEL (#3006)

This will fix an issue where the client still thinks it's allowed to walk through a player that leveled up/down beyond the PROTECTION_LEVEL while being within your client's viewport.

src/player.cpp

@@ -1644,6 +1644,11 @@ void Player::addExperience(Creature* source, uint64_t exp, bool sendText/* = fal
 		g_game.changeSpeed(this, 0);
 		g_game.addCreatureHealth(this);
 
+		const uint32_t protectionLevel = static_cast<uint32_t>(g_config.getNumber(ConfigManager::PROTECTION_LEVEL));
+		if (prevLevel < protectionLevel && level >= protectionLevel) {
+			g_game.updateCreatureWalkthrough(this);
+		}
+
 		if (party) {
 			party->updateSharedExperience();
 		}
@@ -1720,6 +1725,11 @@ void Player::removeExperience(uint64_t exp, bool sendText/* = false*/)
 
 		g_game.changeSpeed(this, 0);
 		g_game.addCreatureHealth(this);
+
+		const uint32_t protectionLevel = static_cast<uint32_t>(g_config.getNumber(ConfigManager::PROTECTION_LEVEL));
+		if (oldLevel >= protectionLevel && level < protectionLevel) {
+			g_game.updateCreatureWalkthrough(this);
+		}
 
 		if (party) {
 			party->updateSharedExperience();