go/consensus/tendermint: Use our notion of latest height

[kostko]

Do not let Tendermint determine the latest height as that completely ignores
ABCI processing so it can return a block for which local state does not yet
exist.

[codecov]

Codecov Report

Merging #2786 into master will increase coverage by 0.18%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2786      +/-   ##
==========================================
+ Coverage   62.88%   63.06%   +0.18%     
==========================================
  Files         389      389              
  Lines       37084    37088       +4     
==========================================
+ Hits        23321    23391      +70     
+ Misses      10789    10706      -83     
- Partials     2974     2991      +17     

Impacted Files	Coverage Δ
go/consensus/tendermint/abci/mux.go	73.06% <100.00%> (+0.12%)	⬆️
go/consensus/tendermint/tendermint.go	67.98% <100.00%> (-0.19%)	⬇️
go/worker/storage/service_external.go	47.31% <0.00%> (-4.31%)	⬇️
go/runtime/tagindexer/tagindexer.go	68.47% <0.00%> (-2.18%)	⬇️
go/worker/storage/committee/checkpointer.go	66.37% <0.00%> (-1.77%)	⬇️
go/storage/mkvs/urkel/iterator.go	84.37% <0.00%> (-1.25%)	⬇️
go/storage/client/client.go	76.76% <0.00%> (-1.25%)	⬇️
go/runtime/transaction/transaction.go	75.90% <0.00%> (-1.21%)	⬇️
go/worker/compute/merge/committee/node.go	75.87% <0.00%> (-0.25%)	⬇️
... and 4 more

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[pro-wh]

https://docs.tendermint.com/master/spec/abci/abci.html#query

Height (int64): The block height for which you want the query (default=0 returns data for the latest committed block). Note that this is the height of the block containing the application's Merkle root hash, which represents the state as it was after committing the block at Height-1

we'd be changing this part of tendermint's query semantics