Cache GtkTreeView::hildon-mode style property earlier
Cache GtkTreeView::hildon-mode style property earlier

hildon_tree_view_set_hildon_ui_mode() depends on this being up to
date, so we need to call it earlier.

Fixes: NB#175659 (One of the account is always highlighted in VoIP and IM accounts selection)

community-ssu/gtk,community-ssu/gtk,community-ssu/gtk,community-ssu/gtk,community-ssu/gtk