Replay: Don't capture iframe if it relies on srcdoc instead of src

Since rrweb doesn't mask the contents of the iframe when it relies on srcdoc. It's best we simply default to blocking it.

@bruno-garcia

@bruno-garcia is this still an issue? Just tested it with a react app and everything was masked there.

~~Closing since we can't reproduce it~~

The issue is that the content of srcdoc is still visible when inspecting the dom in the replay.

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