Problem: decode tx is unnecessary in tx listener

[mmsqe]

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 9.09091% with 20 lines in your changes missing coverage. Please review.

Project coverage is 61.56%. Comparing base (97a30f8) to head (bb14414).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #491   +/-   ##
========================================
  Coverage    61.56%   61.56%           
========================================
  Files          127      128    +1     
  Lines         9473     9476    +3     
========================================
+ Hits          5832     5834    +2     
  Misses        3103     3103           
- Partials       538      539    +1     

Files	Coverage Δ
rpc/stream/rpc.go	0.00% <0.00%> (ø)
app/ante/handler_options.go	61.90% <20.00%> (-1.06%)	⬇️
app/app.go	76.30% <20.00%> (+0.45%)	⬆️
app/ante/tx_listener.go	0.00% <0.00%> (ø)