register signal of wasm in params keeper

[xzav3r]

• 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.

• [ ] Wrote tests

• [ ] Updated relevant documentation (docs/)

• [ ] Added a relevant changelog entry to the Unreleased section in CHANGELOG.md

• [ ] Reviewed Files changed in the github PR explorer

---

For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge PR #XYZ: [title]" (coding standards)

[codecov-commenter]

Codecov Report

Merging #2587 (e4b0576) into dev (a869d4c) will increase coverage by 0.02%. The diff coverage is 62.50%.

@@            Coverage Diff             @@
##              dev    #2587      +/-   ##
==========================================
+ Coverage   35.99%   36.02%   +0.02%     
==========================================
  Files         399      399              
  Lines       42235    42229       -6     
==========================================
+ Hits        15204    15211       +7     
+ Misses      25939    25929      -10     
+ Partials     1092     1089       -3     

Impacted Files	Coverage Δ
x/wasm/keeper/cache.go	24.00% <0.00%> (-1.00%)	:arrow_down:
x/wasm/keeper/keeper.go	80.69% <80.00%> (+1.97%)	:arrow_up:
app/app.go	80.82% <100.00%> (+0.04%)	:arrow_up:

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[xzav3r]

The same thing has been done in pr https://github.com/okex/exchain/pull/2529, so close this