delete unused worker script

Author: acolytec3

packages/vm/src/worker/signatureWorker.ts

@@ -20,8 +20,8 @@ export class SignatureWorkerPool {
 
   constructor(numWorkers: number = 4) {
     const workerCode = `
-            import { parentPort } from 'worker_threads'
-            import { ecrecover } from '@ethereumjs/util'
+            const { parentPort } = require('worker_threads')
+            const { ecrecover } = require('@ethereumjs/util')
 
             parentPort.on('message', (data) => {
                 const { tasks, taskId } = data