Update fee_balancer.py

[Dahka2321]

Time spent on this PR: 0.2 days

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

The current code has several style and type safety issues:

• Uses float division for fee calculations
• Lacks proper type hints
• Has formatting issues with long lines

What is the new behavior?

• Changed float division (/) to integer division (//) for more precise fee calculations
• Added proper type hints to get_total_balance_of_relayers function for better type safety
• Improved code formatting by breaking long lines according to PEP 8 guidelines
• Enhanced readability by properly structuring function parameters

These changes improve code quality and maintainability without changing the core functionality.