fix(Core/Player): Fix two uninitialized variables causing bad fall damage (#23788)

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

@@ -420,6 +420,8 @@ Player::Player(WorldSession* session): Unit(), m_mover(this)
     sScriptMgr->OnConstructPlayer(this);
 
     _expectingChangeTransport = false;
+    _pendingFlightChangeCounter = 0;
+    _mapChangeOrderCounter = 0;
 }
 
 Player::~Player()