Fixed bug when user changes routing parameter and racalculation of route doesn't occur.

Another small bug is this, I am not quite sure how to 100% reproduce it:
 
Calculate a route , then (while still on the route planning screen) press the transport mode button and change a route parameter (like change the "avoid motorways" flag, or the "shortest way" flag). It appears that in some cases the route gets re-calculated instantaneously, but with latest build I find many occurrences where this route-recalculation is not automatically triggered, i.e. you have to manually stop routing (X-button) and then re-start it to see the new route for the new parameter. I think automatic route-recalculation after a parameter change used to work ok, and was broken in the last 2 weeks.
 
It takes several tries to reproduce, the bug does not always seem to occur (Maybe not for all parameters).
 
Best, Hardy