Pixel adjustment on mac

Made the SpinBox and TextField 22 px on mac. Fixed internal
offset.

Change-Id: I36964048415dfedb3db0fac65fb8c1b710ea226f
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com>
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>