go/runtime: fix round in runtime query

[ptrus]

Fixes: #4206

TODO:

• test for GetAnnotatedBlock
• test for querying past rounds

[codecov]

Codecov Report

Merging #4210 (49d712a) into master (9ac02d7) will decrease coverage by 0.57%.
The diff coverage is 70.58%.

❗ Current head 49d712a differs from pull request most recent head 0c98451. Consider uploading reports for the commit 0c98451 to get more accurate results

@@            Coverage Diff             @@
##           master    #4210      +/-   ##
==========================================
- Coverage   69.28%   68.70%   -0.58%     
==========================================
  Files         411      411              
  Lines       47455    47472      +17     
==========================================
- Hits        32878    32616     -262     
- Misses      10540    10824     +284     
+ Partials     4037     4032       -5     

Impacted Files	Coverage Δ
go/runtime/history/history.go	67.21% <33.33%> (-1.76%)	⬇️
go/runtime/client/client.go	67.29% <53.84%> (-0.55%)	⬇️
go/runtime/client/tests/tester.go	100.00% <100.00%> (ø)
go/runtime/host/mock/mock.go	89.69% <100.00%> (ø)
...nsensus/tendermint/apps/keymanager/transactions.go	0.00% <0.00%> (-52.95%)	⬇️
go/ias/http/http.go	20.33% <0.00%> (-44.07%)	⬇️
go/keymanager/api/policy_sgx.go	33.33% <0.00%> (-13.34%)	⬇️
go/runtime/host/sandbox/sandbox.go	71.06% <0.00%> (-9.90%)	⬇️
go/oasis-node/cmd/ias/auth.go	68.96% <0.00%> (-6.90%)	⬇️
...consensus/tendermint/apps/keymanager/keymanager.go	59.34% <0.00%> (-6.60%)	⬇️
... and 37 more

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