Update RawImage.cs

Author: IVogel

tModUnpacker/RawImage.cs

@@ -1,9 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
 using System.Drawing;
 using System.Drawing.Imaging;
 using System.Runtime.InteropServices;