anchor the background images at the top

GitOrigin-RevId: caa4dc0ec3

Jumpy.Shared/JumpyGame.cs

@@ -116,11 +116,11 @@ namespace Jumpy {
 
       // Draw background.
       Rectangle bgSource = new Rectangle(
-        (int) (camera.Left * 0.25), grasslandBg1.Height - camera.Height, camera.Width, camera.Height);
+        (int) (camera.Left * 0.25), 0, camera.Width, camera.Height);
       Rectangle bgTarget = new Rectangle(0, 0, camera.Width, camera.Height);
       spriteBatch.Draw(grasslandBg2, bgTarget, bgSource, Color.White);
       bgSource = new Rectangle(
-        (int) (camera.Left * 0.5), grasslandBg1.Height - camera.Height, camera.Width, camera.Height);
+        (int) (camera.Left * 0.5), 0, camera.Width, camera.Height);
       spriteBatch.Draw(grasslandBg1, bgTarget, bgSource, Color.White);
 
       // Draw player.