update logic for UpdateDelegationBalances function

[ThanhNhann]

Closes: #XXX

Context and purpose of the change

I'm reviewing the code of UpdateDelegationBalances function and see that we should compare the amount of undelegation with zone.StakedBal instead of using AddDelegationToValidator first

stride/x/stakeibc/keeper/icacallbacks_undelegate.go

Line 132 in af53f06

func (k Keeper) UpdateDelegationBalances(ctx sdk.Context, zone types.HostZone, undelegateCallback types.UndelegateCallback) error {

Brief Changelog

update logic for UpdateDelegationBalances function

Author's Checklist

I have...

• Run and PASSED locally all GAIA integration tests
• If the change is contentful, I either:
  • Added a new unit test OR
  • Added test cases to existing unit tests
• OR this change is a trivial rework / code cleanup without any test coverage

If skipped any of the tests above, explain.

Reviewers Checklist

All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.

I have...

• reviewed state machine logic
• reviewed API design and naming
• manually tested (if applicable)
• confirmed the author wrote unit tests for new logic
• reviewed documentation exists and is accurate

Documentation and Release Note

• Does this pull request introduce a new feature or user-facing behavior changes?
• Is a relevant changelog entry added to the Unreleased section in CHANGELOG.md?
• This pull request updates existing proto field values (and require a backend and frontend migration)?
• Does this pull request change existing proto field names (and require a frontend migration)?
  How is the feature or change documented?
  • not applicable
  • jira ticket XXX
  • specification (x/<module>/spec/)
  • README.md
  • not documented

[github-actions]

This pull request has been automatically marked as stale because it has not had any recent activity. It will be closed if no further activity occurs. Thank you!

[sampocs]

lgtm!

[ThanhNhann]

@asalzmann hi ser, can you plz review and merge this pr