BUG AND FIX: Layer manager overflow/scaling

Version: 0.17.19

Are you able to reproduce the bug from the demo?

• Yes
• No

What is the expected behavior? You should be able to see every child in the layer manager

Describe the bug detailed What is the current behavior? Are you able to attach screenshots, screencasts or a live demo? Currently when you go in depth in the layer manager the scaling gets completely messed up like this: https://i.imgur.com/gE20I9G.png

I saw this was mentioned in issue 3463 where it was decided to be an extremely low priority fix. However, I believe I have a very simple fix to the problem. All we have to do is add a display:grid; to the .gjs-layer and it scales perfectly. With this fix it will end up looking as I believe it should: https://i.imgur.com/I7zfz4m.png

I made a PR with the fix before realizing I should first create an issue. So here is both at the same time. PR: https://github.com/artf/grapesjs/pull/3628