[1.8] Fix Scoreboard rendering for the sidebar.

I noticed that the sidebar scoreboard wasn't displayed.

So I compared with the vanilla `GuiIngame` and noticed a little difference. The comparison shows clearly that `scoreobjective1` should be used to render the scoreboard.

Screenshot form net.minecraft.client.gui.GuiIngame, beginning at line 295
![image](https://cloud.githubusercontent.com/assets/3661485/5525600/fa27a4ea-89e8-11e4-886e-dbd4dbff8990.png)