[css3-multicol] Pseudo-algorithm column-width expressions

I noticed a small issue with the expressions used for calculating
column width (W) in the pseudo-algorithm.

(13)    W := max(0, (available-width - ((N - 1) * column-gap)) / N);
....
(17)    W := ((available-width + column-gap) / N) - column-gap;
....
(21)    W := ((available-width + column-gap) / N) - column-gap;

I think line 13 can be changed to contain the same expression used in
lines 17 and 21. i.e.

(13)    W := max(0, ((available-width + column-gap) / N) - column-gap);

Not a big deal, just a bit more consistency.

Cheers
Rich

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