[pgAdmin4][RM3679] Query Tool not working

Hi Hackers,

This is related to a very difficult to reproduce issue where query tool opens blank. Note the disconnected icon, not to be confused with another issue where resizing the query tool works and icon is connected.

Somehow, this occurred on my system (screenshot attached). It turned out to be a webpack issue and many users are facing this (in other projects).

A workaround suggested by https://github.com/webpack/webpack/issues/6094#issuecomment-413178158 is applied in the attached patch.

Kindly review.