Enable the prefer-destructuring eslint rule (#1858)

## Description:

Enable the `prefer-destructuring` eslint rule.

## 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/client/ClientGameRunner.ts

@@ -288,7 +288,7 @@ export class ClientGameRunner {
         this.saveGame(gu.updates[GameUpdateType.Win][0]);
       }
     });
-    const worker = this.worker;
+    const { worker } = this;
     const keepWorkerAlive = () => {
       if (this.isActive) {
         worker.sendHeartbeat();