fix(bar): polar bar should update roundCap when changes #20567

[Ovilia]

Brief Information

This pull request is in the type of:

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

What does this PR do?

Update bar shape when roundCap changes.

Fixed issues

• #20567

Details

Before: What was the problem?

When roundCap changes in later setOption, the bar shape doesn't change from sector to sausage shape.

After: How does it behave after the fixing?

Bar shape changes when roundCap updates.

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

N.A.

Others

Merging options

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

Other information

[echarts-bot[bot]]

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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-20582@7eec3c4