fix(tree-select): use token in tree-select custom render Empty

[GeorgeHcc]

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TreeSelect在自定义empty时token失效，添加 color: token.colorTextDisabled,

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[afc163]

自定义 empty 的话，组件就更不应该预设字色了，你不知道用户希望展现什么样的内容。

[GeorgeHcc]

自定义 empty 的话，组件就更不应该预设字色了，你不知道用户希望展现什么样的内容。

我理解这个不算自定义场景，应该算是设计语言。select、cascader等组件是有这个预设字体色的，应该保持统一

// select/style/dropdown.ts

'&-empty': {
            ...genItemStyle(token),
            color: token.colorTextDisabled,
          },

[afc163]

Select 是加在 empty 的 className 上的，如果要对齐，也要按类似方案处理。直接加在 dropdown 上会影响非 empty 的场景。