Fix variant roll changing when fetching assets #704
Merged
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Resolves #702
If a page loads other assets which pass through the Beacon.Plug, those assets were re-rolling the page variant, which caused the live render to sometimes have a different variant than the dead render (especially when response time is slower).
This PR only allows the initial page request to roll a variant, all other requests passing through that Plug will leave the variant session data untouched.