Add support for literal NaN delay in no-setTimeout-if/no-setInterval-if scriplets

[gorhill]

Related commit:

• uBlockOrigin/uAssets@7bab551

URL:

• https://www.gamesradar.com/metal-gear-solid-animated-series-david-hayter-jordan-vogt-roberts/

Filter:

• gamesradar.com##+js(nosiif)

Discussion:

• https://www.reddit.com/r/firefox/comments/hjcx3y/high_cpu_usage_on_a_number_of_popular_websites/fwp0v9d/?context=3

In the above commit, I erroneously assumed specifying a delay which value is converted to NaN would cause the scriptlet to match properly, but it doesn't, in the end this works because of the match against the function string.

It should be possible to specify literal NaN as delay in those scriptlets, in which case a typed comparison using isNaN() would be used.