Revert writing to IPLD during defaultDecideProposal

[liamsi]

Closes: #436

[Wondertan]

LGTM, though I feel like this should break something unless we do PutBlock elsewhere, don't remember exactly/

[evan-forbes]

@Wondertan I think PutBlock is called when saving the block after it is finalized

https://github.com/lazyledger/lazyledger-core/blob/3ba47c2dd58042cd07d3ac740d7fc2ab54fdab9b/consensus/state.go#L1595-L1595

[liamsi]

@Wondertan if this would break something how would nodes that do not propose work properly?

[liamsi]

Surprisingly, TestWriteDiscoveryReadData times out 🤔 It's not directly related to the code happening during proposal. I'm glad we are moving this out of this repo.

[Wondertan]

@evan-forbes, ok, so we merged that PR with blockstore updates. We have so many unfinished PRs in the repo that I lost track of what is merged and what is not. Hopefully, in the new repo, changes will land much quicker 🤞🏻

[liamsi]

Speaking of open PRs. Do you mind addressing the suggestion in #434 so we can merge it?

[liamsi]

rebased on master