bridge, staking: chg: bug fix

[marcello33]

Description

This PR fixes a bug in staking module.

Changes

• Bugfix (non-breaking change that solves an issue)
• Hotfix (change that solves an urgent issue, and requires immediate attention)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)
• Changes only for a subset of nodes

Nodes audience

Valid for all nodes, required for validators.

Checklist

• I have added at least 2 reviewer or the whole pos-v1 team
• I have added sufficient documentation in code
• I will be resolving comments - if any - by pushing each fix in a separate commit and linking the commit hash in the comment reply

Testing

• I have added unit tests
• I have added tests to CI
• I have tested this code manually on local environment
• I have tested this code manually on remote devnet using express-cli
• I have tested this code manually on mumbai or amoy
• I have created new e2e tests into express-cli

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.40%. Comparing base (98ba715) to head (7fc00b1).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1149      +/-   ##
==========================================
- Coverage   76.59%   76.40%   -0.20%     
==========================================
  Files          53       53              
  Lines        5922     5929       +7     
==========================================
- Hits         4536     4530       -6     
- Misses       1128     1139      +11     
- Partials      258      260       +2     

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