ivi-shell: clean-up transition animation code.

ivi_layout_transition_layer_render_order is not necesary called. Remove
the method and methods called by it.

Signed-off-by: Nobuhiko Tanibata <NOBUHIKO_TANIBATA@xddp.denso.co.jp>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>