fix(pie): fix `endAngle` is not applied on the empty circle

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Brief Information

This pull request is in the type of:

• [x] bug fixing
• [ ] new feature
• [ ] others

What does this PR do?

Fix a bug brought by the endAngle feature - The empty circle should take the configured endAngle into account.

Fixed issues

• #18820

Comparison

Before	After
Preview	Preview

Document Info

One of the following should be checked.

• [x] 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

ZRender Changes

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

Related test cases or examples to use the new APIs

Please refer to test/pie-endAngle.html.

Others

Merging options

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

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[github-actions[bot]]

The changes brought by this PR can be previewed at: https://echarts.apache.org/examples/editor?version=PR-19642@c539b1f

[echarts-bot[bot]]

Congratulations! Your PR has been merged. Thanks for your contribution! 👍