helpers: prefhandler: add missing setPrefSummary()

Signed-off-by: Blechd0se <alex.christ@hotmail.de>
splash: adjustments for small screen sizes

This fits a bit better on small screens like the Defy.

Signed-off-by: Blechd0se <alex.christ@hotmail.de>
memory: fix low mem option will never be checked

While this fixes the checkbox behaviour for this option,
we might also want to cleanup a little bit here.

Signed-off-by: Blechd0se <alex.christ@hotmail.de>