go/consensus/tendermint/apps/roothash: Clear timeout in emitEmptyBlock

[kostko]

TODO

• Cleanup

[codecov]

Codecov Report

Merging #3213 into master will increase coverage by 0.11%.
The diff coverage is 74.78%.

@@            Coverage Diff             @@
##           master    #3213      +/-   ##
==========================================
+ Coverage   67.47%   67.58%   +0.11%     
==========================================
  Files         370      370              
  Lines       36011    36098      +87     
==========================================
+ Hits        24299    24398      +99     
+ Misses       8589     8541      -48     
- Partials     3123     3159      +36     

Impacted Files	Coverage Δ
go/consensus/tendermint/apps/roothash/roothash.go	74.17% <41.37%> (-3.50%)	⬇️
...nsus/tendermint/apps/supplementarysanity/checks.go	47.90% <45.45%> (-0.18%)	⬇️
go/roothash/tests/tester.go	89.72% <90.16%> (-0.31%)	⬇️
.../consensus/tendermint/apps/roothash/state/state.go	78.57% <94.44%> (+1.10%)	⬆️
go/storage/metrics.go	77.02% <0.00%> (-8.11%)	⬇️
go/common/grpc/policy/policy.go	64.38% <0.00%> (-6.85%)	⬇️
...n/crypto/signature/signers/memory/memory_signer.go	71.42% <0.00%> (-4.77%)	⬇️
go/runtime/tagindexer/tagindexer.go	68.47% <0.00%> (-4.35%)	⬇️
.../consensus/tendermint/apps/epochtime_mock/state.go	78.72% <0.00%> (-4.26%)	⬇️
go/storage/api/root_cache.go	74.60% <0.00%> (-3.18%)	⬇️
... and 23 more

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