fix(Area): fixed a bug where className was not assigned to areaDot

[108yen]

Description

Fixed a bug where classname was not assigned when passed to areachart dot as follows.

          <Area
            type="monotone"
            dot={{ className： 'custom-dot-className' }}
            dataKey="uv"
            stroke="#8884d8"
            fill="#8884d8"
          />

Related Issue

#4290

Motivation and Context

Required if you want to assign a className to dot in areachart.

How Has This Been Tested?

Checked in storybook and passed existing tests

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• I have added a storybook story or extended an existing story to show my changes
• All new and existing tests passed.

[ckifer]

Thanks!