fix defineComponent interface; see baidu#717

[coveralls]

Pull Request Test Coverage Report for Build 2064697925

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 97.171%

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Totals
Change from base Build 2020004215:	0.0%
Covered Lines:	3179
Relevant Lines:	3195

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💛 - Coveralls

[errorrik]

我先收了，然后改一下。

Component<{}> 是不对的，应该是 DefinedComponentClass<{}, {}>。Component<{}> 指的是参数是组件的实例。