fix: update dst port when ship captured (#217)

src/core/execution/TradeShipExecution.ts

@@ -91,6 +91,7 @@ export class TradeShipExecution implements Execution {
         return;
       } else {
         this._dstPort = ports[0];
+        this.tradeShip.setDstPort(this._dstPort);
       }
     }
 

src/core/game/Game.ts

@@ -234,6 +234,7 @@ export interface Unit {
   setWarshipTarget(target: Unit): void; // warship only
   warshipTarget(): Unit;
 
+  setDstPort(dstPort: Unit): void;
   dstPort(): Unit; // Only for trade ships
   detonationDst(): TileRef; // Only for nukes
 

src/core/game/UnitImpl.ts

@@ -180,4 +180,8 @@ export class UnitImpl implements Unit {
   dstPort(): Unit {
     return this._dstPort;
   }
+
+  setDstPort(dstPort: Unit): void {
+    this._dstPort = dstPort;
+  }
 }