Fix an off-by-one bug in sort_multipv()

Second parameter of insertion_sort() is a pointer to the
element _after_ the last of the list, e.g. end() when sorting
all items.

If we want to sort say the first 2 moves we should write:

sort_multipv(2);

So, becuase in root moves loop move counter 'i' starts
from 0, we need to pass:

sort_multipv(i+1);

To sort up to move 'i' included.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>