refactor: use the built-in max/min to simplify the code

[pkucode]

Closes: #XXX

Description

Use the built-in max/min from the standard library in Go 1.21 to simplify the code. https://pkg.go.dev/builtin@go1.21.0#max

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Summary by CodeRabbit

• Refactor
  • Streamlined the gas refund process for improved efficiency and clearer logic, ensuring smooth operations without altering the externally visible behavior.

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📝 Walkthrough

Walkthrough

The pull request refactors the GasToRefund function in the gas module by replacing a conditional branch with a straightforward call to the min function. The function now directly returns the lower value between refund and availableRefund, thereby streamlining the control flow. There is no change to any public or exported entities.

Changes

File	Change Summary
x/evm/keeper/gas.go	Simplified the control flow in GasToRefund by replacing the conditional check with a min call.

Sequence Diagram(s)

sequenceDiagram
    participant Client
    participant GasToRefund
    Client->>GasToRefund: Call GasToRefund(refund, availableRefund)
    GasToRefund-->>Client: Return min(refund, availableRefund)

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📜 Recent review details

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Review profile: CHILL
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📥 Commits

Reviewing files that changed from the base of the PR and between ebdace9 and 45a1c24.

📒 Files selected for processing (1)

• x/evm/keeper/gas.go (1 hunks)

🔇 Additional comments (1)

x/evm/keeper/gas.go (1)

86-86: Excellent refactoring to leverage built-in Go 1.21 features.

The use of the min function significantly improves code readability by replacing the conditional logic with a more expressive, single-line implementation. This change aligns well with modern Go practices and makes the code more maintainable.

✨ Finishing Touches

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