We bundle selectize, which is a very old UMD module, built in a way that

makes some poor assumptions. The main poor assumption is that this is

always defined. A modern UMD definition checks globalThis and self

as possible options, and uses those. Not having this meant that we could

hit issues importing this module (or its parent bundle) in a ESM-based

app.
Since newer 0.12.x releases also lack this fix, we're just going to

patch our copy of it for now. In time, we'll want to replace or upgrade

selectize, but that's a far bigger task.

Verified this still worked correctly in Review Board.
Also verified I could now import the containing bundle and not hit

errors about trying to set attributes in undefined.