Обсуждение: [pgAdmin4][Patch]: RM_2637 - Copy functionality in Query Tool doesn'twork after copying from Data Output

Hi

While working on webpacking pgAdmin4, I had removed `document.removeEventListener(...)` temporarily as it was not working in `strict` mode, giving type error and I forgot to include its fix,

because of this copy/paste functionality didn't work properly which is now taken care in this patch.

Please find attached patch and review.

Thanks,

Surinder