Correction for "proper" implementation of div keyword searches

I forgot that CSS attribute selectors are case sensitive :)
I was able to extend zepto with an additional `:attrContains("attr|value")` filter, that is the case-insensitive version of `[attr*="value"]`. It kind of works, but only once per selector.

So this should now match a bunch of other sites. Caveat emptor: we can get into a loop if the site presents an opt-out button after opting-in (see finance.si :)). In that case, we need to exclude those divs by filtering with `falsePositives`, to prevent auto-clicking again.