Added comment marking dependency of a JS variable with warc2zim

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warc2zim's service worker captures all requests and then decides what to do based on
availability of the URL in the ZIM or not.
To allow the external URL blocking mechanism, it needs to known whether this was
enabled or not (as those in-iframe links won't be caught).
It detects this by looking for the `window.block_path` variable that is set in the
`block_external.js` script.

As this is fragile, we're adding a comment so that a future maintainer knows that
a third party tools relies on it.

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