application: Take reference of GFile location when cloning window

Nautilus crashes under d45b820d when we open a second window and
in both windows navigate to a common new location.

This is caused by incorrect reference management in action_clone_window,
where neither nautilus_window_slot_get_location nor
nautilus_window_slot_get_pending_location increases the ref count of
the GFile location. g_autoptr would cause location to be prematurely
freed.

Take the reference of location to allow g_autoptr to work correctly for
all branches of action_clone_window.

Fixes https://gitlab.gnome.org/GNOME/nautilus/-/issues/2858

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