pie图表的label的rotate属性设置不生效，当设置rotate时，显示结果总是rotate='radial'的效果。

[xyang12138]

Version

4.1.0-release

Steps to reproduce

新建pie图表，设置label的totate属性，则无论rotate设置为何值，效果总是radial。

What is expected?

rotate依据设置的结果进行显示

What is actually happening?

无论rotate设置为何值，效果总是radial。

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[pissang]

Currently pie doesn't support label rotation.