fix: fix #551

[yinshuxun]

fix #551

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[fengtianze]

filterable false时的placeholder颜色还是不对

[yinshuxun]

filterable false时的placeholder颜色还是不对

再试试呢

filterable false时的placeholder颜色还是不对

再试试呢，-webkit-text-fill-color 这玩意多余，去掉就好了