Update check stateless ICAAccount

[ThanhNhann]

1. Summary

Fixes #700

• Update stateless check for DecrementBalanceWaitgroup func

2.Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

3. Implementation details

4. How to test/use

5. Checklist

• Does the Readme need to be updated?

6. Limitations (optional)

7. Future Work (optional)

[codecov]

Codecov Report

Merging #719 (d3eae3f) into main (7521baa) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #719   +/-   ##
=======================================
  Coverage   13.40%   13.40%           
=======================================
  Files         243      243           
  Lines       63047    63047           
=======================================
  Hits         8450     8450           
  Misses      53919    53919           
  Partials      678      678           

Flag	Coverage Δ
unittests	13.40% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
x/interchainstaking/types/accounts.go	100.00% <100.00%> (ø)

[joe-bowman]

this will have no functional change, but for the sake of correctness, lgtm.