[BugFix] Rose chart (area roseType) angles not uniform when end angle is not auto

[rishyanthkondra]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

• Donot modify the angle for roseType: 'area' charts strictly

Fixed issues

N.A

Details

Before: What was the problem?

// This example requires ECharts v5.5.0 or later
option = {
  tooltip: {
    trigger: 'item'
  },
  legend: {
    top: '5%',
    left: 'center'
  },
  series: [
    {
      name: 'Access From',
      type: 'pie',
      roseType: 'area',
      radius: ['40%', '70%'],
      center: ['50%', '70%'],
      // adjust the start and end angle
      startAngle: 180,
      endAngle: 360,
      data: [
        { value: 1000, name: 'Search Engine' },
        { value: 500, name: 'Direct' },
        { value: 250, name: 'Email' },
      ]
    }
  ]
};

After: How does it behave after the fixing?

Document Info

One of the following should be checked.

• This PR doesn't relate to document changes
• The document should be updated later
• The document changes have been made in apache/echarts-doc#xxx

Misc

Security Checking

• This PR uses security-sensitive Web APIs.

ZRender Changes

• This PR depends on ZRender changes (ecomfe/zrender#xxx).

Related test cases or examples to use the new APIs

N.A.

Merging options

• Please squash the commits into a single one when merging.

Other information

N.A.

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