Add back the trade ship send stat (#1253)

## Description:

trade ship send stats was erroneously removed, add it back

## 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
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

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

evan

src/core/execution/TradeShipExecution.ts

@@ -46,6 +46,7 @@ export class TradeShipExecution implements Execution {
         targetUnit: this._dstPort,
         lastSetSafeFromPirates: ticks,
       });
+      this.mg.stats().boatSendTrade(this.origOwner, this._dstPort.owner());
     }
 
     if (!this.tradeShip.isActive()) {