Fix trainwreck bug (#1925)

## Description:

Fixes #1922, the trainwreck bug.

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

src/core/execution/TrainStationExecution.ts

@@ -62,13 +62,9 @@ export class TrainStationExecution implements Execution {
 
   private spawnTrain(station: TrainStation, currentTick: number) {
     if (this.mg === undefined) throw new Error("Not initialized");
+    if (!this.spawnTrains) return;
     if (this.random === undefined) throw new Error("Not initialized");
-    if (
-      !this.spawnTrains ||
-      currentTick - this.lastSpawnTick < this.ticksCooldown
-    ) {
-      return;
-    }
+    if (currentTick < this.lastSpawnTick + this.ticksCooldown) return;
     const cluster = station.getCluster();
     if (cluster === null) {
       return;