fix: fixing the amino-json sign on MsgLeveragedLiquidate

[gsk967]

Description

closes: #XXXX

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Author Checklist

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I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
• added appropriate labels to the PR
• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• added a changelog entry to CHANGELOG.md
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• reviewed "Files changed" and left comments if necessary
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Reviewers Checklist

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I have...

• confirmed the correct type prefix in the PR title
• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

[codecov]

Codecov Report

Merging #2196 (9406832) into main (7f05ad4) will decrease coverage by 6.29%.
Report is 181 commits behind head on main.
The diff coverage is 79.35%.

@@            Coverage Diff             @@
##             main    #2196      +/-   ##
==========================================
- Coverage   75.38%   69.10%   -6.29%     
==========================================
  Files         100      166      +66     
  Lines        8025    12597    +4572     
==========================================
+ Hits         6050     8705    +2655     
- Misses       1589     3338    +1749     
- Partials      386      554     +168     

Files Changed	Coverage Δ
ante/spam_prevention.go	75.92% <ø> (ø)
cmd/ibc_denom/main.go	0.00% <0.00%> (ø)
util/coin/coin.go	12.50% <0.00%> (ø)
x/incentive/codec.go	47.82% <ø> (+9.89%)	⬆️
x/incentive/keeper/invariants.go	0.00% <0.00%> (ø)
x/incentive/keeper/reward.go	82.35% <ø> (ø)
x/incentive/keeper/store.go	70.67% <ø> (ø)
x/incentive/keeper/unbonding.go	80.45% <ø> (ø)
x/incentive/keeper/update.go	52.11% <ø> (ø)
x/incentive/keys.go	100.00% <ø> (ø)
... and 59 more

... and 68 files with indirect coverage changes