CardShell: use a smaller corner radius

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>
WindowManager: set correct size for window when in maximized/fullscreen mode

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>
OverlayManager: no need to scale the overlay window anymore

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>
FirstUseShell: workaround for bug in Loader, resulting in keyboard being wrongly resized at first boot use. Now we ognore the signals from the compositor if the first use app has been closed.

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>