fix(rpc): wrong block number in debug trace related api (backport: #1591)

[mmsqe]

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Description

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For contributor use:

• Targeted PR against correct branch (see CONTRIBUTING.md)
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• Wrote unit and integration tests
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[codecov]

Codecov Report

Merging #213 (872fb68) into release/v0.20.x-cronos (95ec96b) will not change coverage.
The diff coverage is 100.00%.

@@                   Coverage Diff                   @@
##           release/v0.20.x-cronos     #213   +/-   ##
=======================================================
  Coverage                   57.27%   57.27%           
=======================================================
  Files                         108      108           
  Lines                       10104    10104           
=======================================================
  Hits                         5787     5787           
  Misses                       4071     4071           
  Partials                      246      246           

Impacted Files	Coverage Δ
x/evm/keeper/grpc_query.go	87.58% <100.00%> (ø)