Fix typo in Chapter 8: game1.cs (#200)

Author: shining-luna

articles/tutorials/building_2d_games/08_the_sprite_class/snippets/game1.cs

@@ -59,7 +59,7 @@ protected override void Draw(GameTime gameTime)
         SpriteBatch.Begin(samplerState: SamplerState.PointClamp);
 
         // Draw the slime sprite.
-        _slime.Draw(SpriteBatch, Vector2.One);
+        _slime.Draw(SpriteBatch, Vector2.Zero);
 
         // Draw the bat sprite 10px to the right of the slime.
         _bat.Draw(SpriteBatch, new Vector2(_slime.Width + 10, 0));
@@ -69,4 +69,4 @@ protected override void Draw(GameTime gameTime)
 
         base.Draw(gameTime);
     }
-}
+}