revert OnDealExpiredOrSlashed changes

[dirkmc]

Revert #616 due to a bug in filecoin-project/lotus#5431, described in filecoin-project/lotus#7214

[codecov-commenter]

Codecov Report

Merging #620 (9a1bc35) into master (f0294e2) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #620   +/-   ##
=======================================
  Coverage   65.36%   65.36%           
=======================================
  Files          62       62           
  Lines        4459     4459           
=======================================
  Hits         2914     2914           
  Misses       1264     1264           
  Partials      281      281           

Impacted Files	Coverage Δ
storagemarket/impl/clientstates/client_states.go	89.03% <100.00%> (ø)
...oragemarket/impl/providerstates/provider_states.go	85.38% <100.00%> (ø)

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[Stebalien]

@dirkmc I've cherry-picked the events changes back to filecoin-project/lotus#7000.

[dirkmc]

Great thanks for doing that 👍