chore: correct typos about Dtk::Gui::DDciIcon::IconAttribute

[felixonmars]

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File	Line	Symbol
include/util/ddciicon.h	88	Dtk::Gui::DDciIcon::Q_FLAGS

[kegechen]

会引起接口变动，谨慎点
是否废弃旧的然后增加新的？
dtk6 统一删除typo接口

[asterwyx]

涉及到api变动需要以兼容的方式进行修改，建议在DTK5的环境下添加using IconAttibute=IconAttribute;

[deepin-bot]

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New tag: 5.6.21
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New tag: 5.6.32
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