ms argument to watchStuckJobs is optional (#36295)

See 87d61503d3/lib/kue.js (L270-L273) and documentation:

> ```js
> queue.watchStuckJobs(interval)
> ```
> `interval` is in milliseconds and defaults to 1000ms

types/kue/index.d.ts

@@ -31,7 +31,7 @@ export declare class Queue extends events.EventEmitter {
     setupTimer(): void;
     checkJobPromotion(ms: number): void;
     checkActiveJobTtl(ttlOptions: Object): void;
-    watchStuckJobs(ms: number): void;
+    watchStuckJobs(ms?: number): void;
     setting(name: string, fn: Function): Queue;
     process(type: string, fn?: ProcessCallback): void;
     process(type: string, n: number, fn?: ProcessCallback): void;