fix: add border-radius to control bar in ColorPicker

[Debbl]

Types of changes

• New feature
• Bug fix
• Enhancement
• Documentation change
• Coding style change
• Component style change
• Refactoring
• Test cases
• Continuous integration
• Typescript definition change
• Breaking change
• Others

Background and context

the arco-color-picker-control-bar-bg doesn't have set border-radius, causing the content to stand out.

Solution

set border-radius: 10px for the arco-color-picker-control-bar-bg.

How is the change tested?

Changelog

Component	Changelog(CN)	Changelog(EN)	Related issues

Checklist:

• Test suite passes (npm run test)
• Provide changelog for relevant changes (e.g. bug fixes and new features) if applicable.
• Changes are submitted to the appropriate branch (e.g. features should be submitted to feature branch and others should be submitted to main branch)

Other information

I can't run test commands on my local environment.

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