Bug with WS global patching causing netplay black screen

[CanyonTurtle]

Bug description

Currently, netplay URLs do not load on desktop web and mobile web.

Reproduce

On any computer browser (e.g. chrome), visit a wasm4 game (e.g. https://wasm4.org/play/kittygame) and press enter->copy netplay URL. Now open another tab and paste. Observe a black screen. Open developer console and see the error:

Uncaught (in promise) TypeError: set WebAssembly.Global.value): Can't set the value of an immutable global.
    at Ct.write (wasm4.js:50:9105)
    at RTCDataChannel.<anonymous> (wasm4.js:50:20165)

Fix exploration

Now observe that if you use devtool source overrides (https://stackoverflow.com/a/61377922), comment out the problematic line (wasm4.js line 50), save, and reload, netplay functions as normal.

This appears to be caused by #715 with this specific change. @JerwuQu any ideas for a fix? I could look myself but I don't want to jump in and break global patching, as I don't know how that part of the codebase works just yet.