fix(rpc): estimate gas error response

[ramacarlucho]

Closes: #XXX

Description

Fix estimate gas rpc response error when height provided is in the future.

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For contributor use:

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• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
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For admin use:

• Added appropriate labels to PR (ex. WIP, R4R, docs, etc)
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[codecov]

Codecov Report

Merging #1340 (e3692b2) into main (acf1547) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1340      +/-   ##
==========================================
- Coverage   54.80%   54.79%   -0.02%     
==========================================
  Files         107      107              
  Lines        9988     9990       +2     
==========================================
  Hits         5474     5474              
- Misses       4243     4245       +2     
  Partials      271      271              

Impacted Files	Coverage Δ
rpc/backend/call_tx.go	0.00% <0.00%> (ø)