fix: dnd in popout window through react portal

[parassantra]

This fixes #442

I have attached a codesandbox with version "@hello-pangea/dnd": "18.0.1" :

1. this example shows when popout button is clicked and DnD list moves to new window created through portal, it breaks and drag and drop doesn't work. refer to console log for errors
   https://codesandbox.io/p/sandbox/vibrant-https-wfc2lm

I have also attached a codesandbox with version from my fork "@parassantra/dnd-popout-fix": "18.0.1-popout-fix.0"
which has patch from current PR:

1. Here we can clearly see when popout button is clicked and DnD list moves to new window created through portal, it works fine and no console errors are there.
   https://codesandbox.io/p/sandbox/qm4rtn?file=%2Fpackage.json%3A12%2C5-12%2C57