Fix missing closing brace in update() function

The if (state == WorldState::IN_WORLD) block was missing its closing brace.
This was introduced during the large SP removal when methods were deleted with sed.

Now: 450 open, 450 close (balanced)

src/game/game_handler.cpp

@@ -178,6 +178,7 @@ void GameHandler::update(float deltaTime) {
             entity->updateMovement(deltaTime);
         }
     }
+}
 
 void GameHandler::handlePacket(network::Packet& packet) {
     if (packet.getSize() < 1) {