fix: update the primary color index

[rtpacks]

Types of changes

• New feature
• Bug fix
• Documentation change
• Coding style change
• Refactoring
• Performance improvement
• Test cases
• Continuous integration
• Typescript definition change
• Breaking change

Background and context

#6 预设的灰色主颜色索引位置错误

Solution

更新预设的灰色主颜色索引位置

How is the change tested?

Changelog

Changelog(CN)	Changelog(EN)	Related issues
更新预设的灰色主颜色索引位置	update the primary color index	#6

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 master branch)

Other information