[pgAdmin4][Patch]: RM_2637 - Copy functionality in Query Tool doesn't work after copying from Data Output

[Surinder Kumar]

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

RM_2637.patch
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