Update input-var-list.tsx

[Wuhu-dsm]

Fix problem that the picker can't support show zero

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Description

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Fixes

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update, included: Dify Document
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• Dependency upgrade

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[crazywoola]

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