Avi Vahl dc19e59164 fix: ensure fallback to default system monospace font (#282747)
This PR actually fixes an issue experienced when monaco-editor (the npm package) is used in a website loaded using Firefox on Linux.

By using quotes, the `'monospace'` family causes Firefox to load "Noto Arabic" on my system. Should be noted I have a _clean_ Fedora 43 installation, with the default Gnome 49 installed fonts. `monospace` without the quotes resolves to Noto Sans Mono, as expected.

I see absolutely no difference for default font rendering inside Chromium-based web views. Testing with monaco-editor in Google Chrome and VSCode inside Electron.

Most Gnome-based Linux distros moved away from the Droid font-family, and are currently using the Noto font-family, but I'll leave that up to you guys. `monospace` (without quotes) properly resolves to Noto.

I've tracked where this `'monospace'` value came from, and it seems to have been added in https://github.com/microsoft/vscode/commit/b99f4148788ae790c6621ed62550e78be29408d7
as part of not using Courier New on Linux. Seems like an oversight from my end.
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