The cancellation of move should not compute cost price

because such move can not be done (prevented by _deny_modify_done_cancel)

issue4107
review12441002
(grafted from b6cd235dd1b38f4533ef9691925f5d3c960a63bb)

--HG--
branch : 2.8
extra : source : b6cd235dd1b38f4533ef9691925f5d3c960a63bb