Problem: decode tx is unnecessary in tx listener (backport: #491)

[mmsqe]

• Problem: decode tx is unnecessary in tx listener

• cleanup

Closes: #XXX

Description

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For contributor use:

• Targeted PR against correct branch (see CONTRIBUTING.md)
• 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
• Re-reviewed Files changed in the Github PR explorer

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For admin use:

• Added appropriate labels to PR (ex. WIP, R4R, docs, etc)
• Reviewers assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

Attention: Patch coverage is 44.44444% with 10 lines in your changes missing coverage. Please review.

Project coverage is 64.14%. Comparing base (b82677b) to head (960508b).

Additional details and impacted files

@@                    Coverage Diff                     @@
##           release/v0.22.x-cronos     #492      +/-   ##
==========================================================
+ Coverage                   64.07%   64.14%   +0.07%     
==========================================================
  Files                         129      130       +1     
  Lines                        9739     9740       +1     
==========================================================
+ Hits                         6240     6248       +8     
+ Misses                       2992     2984       -8     
- Partials                      507      508       +1     

Files	Coverage Δ
app/ante/handler_options.go	83.33% <100.00%> (+0.28%)	⬆️
rpc/stream/rpc.go	0.00% <0.00%> (ø)
app/ante/tx_listener.go	60.00% <60.00%> (ø)
app/app.go	81.38% <20.00%> (+0.56%)	⬆️