fix: fix slice init length

[wangjingcun]

Description

The intention here should be to initialize a slice with a capacity of len(byzantineValidators) rather than initializing the length of this slice.

The online demo: https://go.dev/play/p/q1BcVCmvidW

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• confirmed the correct type prefix in the PR title
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[insumity]

Thanks. This is already fixed here.

[wangjingcun]

Thanks. This is already fixed here.

Thanks！