generate random numbers as floats

as they get converted from double before use anyway

OpenRA.Game/WorldUtils.cs

@@ -127,7 +127,7 @@ namespace OpenRA
 
 		public static float Gauss1D(this Thirdparty.Random r, int samples)
 		{
-			return Exts.MakeArray(samples, _ => (float)r.NextDouble() * 2 - 1f)
+			return Exts.MakeArray(samples, _ => r.NextFloat() * 2 - 1f)
 				.Sum() / samples;
 		}