legend单独设置icon时，itemHeight在v5.0.1和v5.2.0显示不一致

[HAM2506]

Version

5.2.0

Reproduction link

https://codepen.io/ham2506/pen/mdwMxVW

Steps to reproduce

单独给legend设置icon path，预期icon应该显示为直线，在v4.x和v5.0.1的版本是符合预期的，但是在v5.2.0显示为方块。

What is expected?

legend icon显示为直线

What is actually happening?

legend icon显示为方块

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[echarts-bot]

@HAM2506 It seems you are not using English, I've helped translate the content automatically. To make your issue understood by more people, we'd like to suggest using English next time. 🤗

TRANSLATED

TITLE

When legend sets the icon alone, itemHeight is inconsistent in v5.0.1 and v5.2.0

BODY

Version

5.2.0

Reproduction link

https://codepen.io/ham2506/pen/mdwMxVW

Steps to reproduce

Set the icon path to legend separately, expecting icon to appear as a straight line, which is expected in v4.x and v5.0.1 versions, but as a block in v5.2.0.

What is expected?

Legend icon appears as a straight line

What is actually happening?

Legend icon appears as a block