[Dashboard] 调色板无作用, 主题色没有保存的错误

**📄 Describe the bug**
As title said.

**⛏ To Reproduce**
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**⚒ Expected behavior**
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**🖼 Screenshots**
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**🖥 Desktop (please complete the following information):**
 - OS: ...
 - Version ...

**📱 Smartphone (please complete the following information):**
 - Device: ...
 - OS: ...
 - Version ...

**📎 Additional context**
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