abort the timeout when a nummernschalter_active event occurs in DialingState

fetapdtest.py

@@ -188,6 +188,7 @@ class DialingState(AbstractState):
 		return IdleState
 
 	def on_nummernschalter_active(self):
+		self._controller.abort_timeout()
 		if self.__dial_tone:
 			self._controller.get_phone().stop_playing()