Add frame icon for take screenshot

Add frame icon for take screenshot, this fixes #SL4015, this patch has been thought-out for the touch

<b>Icon for display frame are needed!</b>

Signed-off-by: Ignacio Rodríguez <ignaciorodriguez@sugarlabs.org>

![captura de pantalla - 271113 - 13 46 34](https://f.cloud.github.com/assets/2650479/1632655/9ddcca80-577b-11e3-9378-6ac0fbaf14ef.png)

Preview video: http://sugarlabs.org/~ignacio/Archivos/Sugar.mkv