Make CI,ci0 in example non-degenerate to RowMajor / ColMajor

[alecjacobson]

The example in src/main.cc (accidentally) works even if matrices are passed in column major order instead of QuadProg++'s expected row major order. H is symmetric so under doesn't matter. Likewise, CE is 1x1. But CI is a rectangular matrix and passing its entries in the wrong order (with ci0 left as is), will produce a correct result. As a result I got this example running and then assumed QuadProg++ was using Column Major ordering (doh!).

Not sure many people will run into the same issue as me, but just in case: here's a tiny fix that simply permutes the order of the constraints in CI and ci0 in the example so that using column major will not produce the same result (and in fact will make the problem infeasible).