fix: fix taskDone duplicate listener (#895)

Co-authored-by: dezremnacui <dezremnacui@gmail.com>
(cherry picked from commit 1775b91)

Author: 2 people

src/index.ts

@@ -673,6 +673,8 @@ class ThreadPool {
         }
       };
 
+      this.workers.onTaskDone(checkIfWorkerIsDone);
+
       for (const workerInfo of this.workers) {
         checkIfWorkerIsDone(workerInfo);