Improve compatibilty (ios)

[ryanbr]

Just a request from a Brave dev,

Just that requestIdleCallback is unsupported in safari so if we use these scripts in iOS this causes errors. we need to default to setTimeout when requestIdleCallback is undefined

brave/adblock-resources#115

[gorhill]

I don't see a request in there. It's concerning a "deAmp" scriptlet, which we do not have here.

[ryanbr]

Will confirm

[ryanbr]

https://github.com/brave/uBlock/blob/076c831bb17fc2acd94dde7d5ac4954b673efaa8/assets/resources/scriptlets.js#L1377C25-L1377C25