Fix transportship target tile on construction (#2896)

## Description:

The recent pathfinding rework broke the naval invasion target.
This change reverts the code to the previous working one.

<img width="232" height="273" alt="image"
src="https://github.com/user-attachments/assets/0cc3ed80-bd77-4e7b-886b-0ce5012840ac"
/>


## 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

## Please put your Discord username so you can be contacted if a bug or
regression is found:

IngloriousTom

Author: DevelopingTom

src/core/execution/TransportShipExecution.ts

@@ -143,14 +143,9 @@ export class TransportShipExecution implements Execution {
 
     this.boat = this.attacker.buildUnit(UnitType.TransportShip, this.src, {
       troops: this.startTroops,
+      targetTile: this.dst ?? undefined,
     });
 
-    if (this.dst !== null) {
-      this.boat.setTargetTile(this.dst);
-    } else {
-      this.boat.setTargetTile(undefined);
-    }
-
     // Notify the target player about the incoming naval invasion
     if (this.targetID && this.targetID !== mg.terraNullius().id()) {
       mg.displayIncomingUnit(