[openload] fix extractor

[Tithen-Firion]

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Description of your pull request and other information

Fixes #10408, for now. I've translated deobfuscated JavaScript to Python and tweaked it a bit. Problematic part was parseInt since it can return NaN from empty string. Python's int will just throw ValueError. I've solved it with or '0' but it wont work in this case:

var a = parseInt(''); // NaN
var b = a + 3;        // NaN again, same for `3 + a`
var c = b & 1;        // 0, same for `1 & b`

a = int('' or '0') # 0
b = a + 3          # 3
c = b & 1          # 1

I don't know how to replicate this behaviour in Python but luckily it's not needed for current version of decoder.

[yan12125]

Thanks! FYI: python has float('nan')

[Tithen-Firion]

It does, but float('nan') & 1 throws

TypeError: unsupported operand type(s) for &: 'float' and 'int'

I guess custom NaN class and parseInt function behaving like those in JS are needed.