[HildonPannableArea] Explicitly unmap during unrealization
[HildonPannableArea] Explicitly unmap during unrealization

Since GtkWidget won't necessarily emit GtkWidget::unmap during
unrealization, we need to explicitly unmap if necessary to avoid
leaving our resources and handlers lying around. See bgo#613302.

Fixes: NB#160879 (crash in pannable area with glib 2.23.5)

archlinuxarm-n900/libhildon,archlinuxarm-n900/libhildon,community-ssu/hildon,community-ssu/hildon,community-ssu/hildon,archlinuxarm-n900/libhildon