fixup! front: fold deleted origin's arrival time into start time

Author: Akctarus

front/src/applications/operationalStudies/views/Scenario/components/ManageTrainSchedule/helpers/formatTrainSchedulePayload.ts

@@ -17,7 +17,7 @@ import formatSchedule from './formatSchedule';
  * This is necessary because our backend API do not allow the first
  * waypoint to have an arrival time.
  */
-export function normalizeFirstWaypointTimes(
+function normalizeFirstWaypointTimes(
   pathSteps: PathStep[],
   startTime: number
 ): { pathSteps: PathStep[]; startTime: number } {