[Polish] Clean up miscellaneous "walk" directions from the server when sending Intermediate Stops

[pingzing]

Right now the server:
a.) Only responds with a single proposed itinerary
and
b.) Has random spurious "walking" legs between the intermediates that can usually be combined.

We should try to see if we can resolve b.), and maaaybe a.).

[pingzing]

Update: Server seems to correctly return more than one result now. Just need to worry about b.).