delete staking weight by proposal

[zjg555543]

• 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 #3108 (b424152) into dev (82fca45) will decrease coverage by 0.01%. The diff coverage is 45.45%.

:exclamation: Current head b424152 differs from pull request most recent head 54f8a02. Consider uploading reports for the commit 54f8a02 to get more accurate results

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@@            Coverage Diff             @@
##              dev    #3108      +/-   ##
==========================================
- Coverage   35.90%   35.90%   -0.01%     
==========================================
  Files         434      434              
  Lines       45786    45791       +5     
==========================================
  Hits        16441    16441              
- Misses      28154    28157       +3     
- Partials     1191     1193       +2     

Impacted Files	Coverage Δ
app/app.go	81.78% <0.00%> (-0.47%)	:arrow_down:
x/staking/keeper/proxy.go	37.62% <50.00%> (ø)
x/staking/keeper/weight.go	84.61% <66.66%> (+2.79%)	:arrow_up:

... and 1 file with indirect coverage changes

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