Minor tweaks to staker contract

[otherview]

Description

Includes minor changes to the staker contract.

Fixes # (issue)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• New and existing E2E tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have not added any vulnerable dependencies to my code

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 89.13043% with 5 lines in your changes missing coverage. Please review.

Project coverage is 59.73%. Comparing base (bff9fb6) to head (0b4ba4a).

Files with missing lines	Patch %	Lines
builtin/staker_native.go	86.11%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@                 Coverage Diff                  @@
##           release/hayabusa    #1179      +/-   ##
====================================================
+ Coverage             59.70%   59.73%   +0.02%     
====================================================
  Files                   266      266              
  Lines                 28088    28114      +26     
====================================================
+ Hits                  16770    16793      +23     
- Misses                 9815     9817       +2     
- Partials               1503     1504       +1     

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