[ODE] Bug in CCylynder vs CCylynder collision test

[Michal Bacik]

There seems to be bug in CCylynder vs CCylynder collision test - when they
are dropped one onto another, sharing exactly the same XY coordinates, the
collision won't detect it and they penetrate without generating contact
points.

How to repro: run test_boxstack.cpp example, press 'r' (no random position),
and press 'c' two times. You should see 2 capped cylinders falling one onto
the other (and actually go into each other).

- m