fix(transport_helper): make sure journeys contain start+endstation

lib/transport_helper.dart

@@ -145,6 +145,7 @@ class Journey {
       endStation = null;
       duration = Duration(minutes: 0);
     }
+    _dbUpdate();
   }
 
   void addSegment(Segment newSeg) {
@@ -224,6 +225,7 @@ class Journey {
   static Future<Journey> fromMapWrapper(Map<String, Object?> journeyMap) async {
     Future<List<Segment>> segs = _dbGetJourneySegments(journeyMap["id"] as int);
     Journey res = Journey.fromMap(journeyMap, await segs);
+    res.sync();
     return res;
   }