CommitBatcher getSectorDeadline should check the earlier PreCommit expiry in the batch

[jennijuju]

Currently, PreCoomitBatcher and CommitBatcher shares getSectorDeadline.

lotus/extern/storage-sealing/commit_batch.go

Line 455 in fadc79a

func getSectorDeadline(curEpoch abi.ChainEpoch, si SectorInfo) time.Time {

however, in additional to deal expirations, commit batcher should also make sure it pushes the aggregation message before any of the sectors is going to expired for MaxProveCommitDuration. Therefore, instead of checking si.TicketEpoch + policy.MaxPreCommitRandomnessLookback CommitBatcher should be checking SectorPreCommitOnChainInfo.PreCommitEpoch + MaxProveCommitDuration