list-view: explicitly set cursor on file name cell renderer on rename

The file name column has two cell renderers, one for the icon and another for
the name string. Thus, gtk_tree_view_set_cursor() isn't enough to reliably
start editing the file name cell since it will try to edit whatever is the
currently focused cell in the column.

https://bugzilla.gnome.org/show_bug.cgi?id=656128