Improve Tie-Breaking on Phantom Node Snapping on Oneway Segments

[MoKob]

This issue is more a test-case issue but it can happen for anything snapping directly to intersections.

When choosing among phantom nodes, we should consider the oneway flag for tie-breaking.

In cases with e1 = (a,b), e2 = (b,c) both oneways and e3 = (b,d), a route from b to d can only be found in two of the three possible segments we can snap to. If we consider the oneway tag, we could always snap to e3 over e1 or e2 and ensure that we can find a route in any possible case.