The custom drawing is removed and replaced with a "normal" PNG.
By doing this the icons are no longer pixelated on high resolution
displays.

Change-Id: I758f4cd9e5d4752a798c915aeb39b1989cb33a4a
Signed-off-by: Lars Vogel <Lars.Vogel@vogella.com>
Also-by: Matthias Becker <ma.becker@sap.com>