Zimit2: iframe on womenshistory.si.edu/events/mysterious-mrs-nixon is not working

[benoit74]

See https://github.com/openzim/zim-requests/issues/1121#issuecomment-2247069588

First problem is similar to https://github.com/openzim/warc2zim/issues/293, i.e. we need to set isSW: false.

However, this is not sufficient, once set to false we have a weird result:

WARC is working OK on replayweb.page

Marking the bug as upstream because to me this looks like a ~~wabac.js~~ wombat issue, I will open one right away.