sector import: fix evaluating randomness when importing a sector

[mtrisic]

Related Issues

Fixes #11122

Proposed Changes

SectorReceive API mistakenly expects RandomnessFromTicket as a result of WaitSeed. However, we should be using RandomnessFromBeacon instead. Hence, I have changed a call of StateGetRandomnessFromTickets with StateGetRandomnessFromBeacon.

Additional Info

Info about this issue discussed on Filecoin slack, #fil-lotus-dev, ID p1690821347448089

Checklist

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[magik6k]

Great find, I can imagine figuring this out took a while.

Thanks for the PR!