fix route recalculation and screen update issue on MapActivity resume

I think https://github.com/osmandapp/Osmand/pull/948 should also be available in r1.9:
https://groups.google.com/d/msg/osmand/0Bc5GnZO-YE/utSzVYYy-VAJ
https://code.google.com/p/osmand/issues/detail?id=2446