fix typo in val_state_change.go

[loin3]

Description

typo error fixed in x/staking/keeper/va_state_change.go UnbondingToUnbonded function sanity check error message. This PR changed error message from bad state transition unbondingToBonded to bad state transition unbondingToUnbonded because function name is UnbondingToUnbonded.

Motivation and context

How has this been tested?

Screenshots (if appropriate):

Checklist:

• I followed the contributing guidelines and code of conduct.
• I have added a relevant changelog to CHANGELOG.md
• I have added tests to cover my changes.
• I have updated the documentation accordingly.
• I have updated API documentation client/docs/swagger-ui/swagger.yaml

[codecov]

Codecov Report

Merging #728 (1a6cfed) into main (15168bf) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #728      +/-   ##
==========================================
- Coverage   61.98%   61.96%   -0.03%     
==========================================
  Files         874      874              
  Lines       98608    98614       +6     
==========================================
- Hits        61127    61108      -19     
- Misses      33869    33907      +38     
+ Partials     3612     3599      -13     

Impacted Files	Coverage Δ
x/staking/keeper/val_state_change.go	59.09% <100.00%> (+0.75%)	⬆️
x/collection/msgs.go	33.88% <0.00%> (-5.00%)	⬇️
x/token/validation.go	87.27% <0.00%> (-3.64%)	⬇️
x/collection/collection.go	78.57% <0.00%> (-1.79%)	⬇️
x/wasm/keeper/keeper.go	85.80% <0.00%> (-0.37%)	⬇️
baseapp/params.go	100.00% <0.00%> (ø)
x/token/msgs.go	34.51% <0.00%> (+4.06%)	⬆️