plymouth theme: Use scaling for logo.

components/bootsplash/theme.script

@@ -104,9 +104,12 @@ Plymouth.SetDisplayNormalFunction(display_normal_callback);
 Plymouth.SetDisplayPasswordFunction(display_password_callback);
 
 #----------------------------------------- Logo --------------------------------
-slinux_logo.image = Image ("slinux.png");
+slinux_logo.raw = Image ("slinux.png");
+scale_factor = Window.GetHeight() / slinux_logo.raw.GetHeight() * 0.5;
+slinux_logo.image = imgscale (slinux_logo.raw, scale_factor);
 slinux_logo.sprite = Sprite (slinux_logo.image);
 
+slinux_logo.sprite.SetOpacity (0);
 slinux_logo.x = Window.GetX() + Window.GetWidth() / 2 - slinux_logo.image.GetWidth() / 2;
 slinux_logo.y = Window.GetY() + Window.GetHeight() / 2 - slinux_logo.image.GetHeight() / 2;
 slinux_logo.sprite.SetPosition (slinux_logo.x, slinux_logo.y, 0);