Use xmlMemStrdup() to override the type as it's expected to be allocated

* e-shortcuts.c (load_shortcuts): Use xmlMemStrdup() to override
the type as it's expected to be allocated by libxml later on.
Also, get the icon for the storage if the shortcut points to a
storage.

* e-storage-set-view.c (etree_icon_at): Don't special case the
Summary storage.  Rather, use `e_storage_get_toplevel_node_type()'
for getting the type of the node.

* e-shortcuts-view-model.c (get_icon_for_item): New helper
function.
(shortcuts_update_shortcut_cb): Use it.
(shortcuts_new_shortcut_cb): Use it.
(load_group_into_model): Use it.

svn path=/trunk/; revision=12232

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