actions (like play record) sometimes affect the wrong station

Selection preservation is not working correct. This sometimes leads to the effect that an action (like play and record) affects not the current selected station but instead the previous one.

This can be observed when a selected station is no longer present in an updated station list (after refresh, bitrate filtering or searching). The selection should have been cleared but instead the old position of the selected station is still marked. The actions however are still targeted on the old station and thus triggering an action won't have an effect on the current selected station.

affects 0.4.0