fix(legend): symbolRotate for legend is neither inherited nor being set

[sz-p]

Brief Information

This pull request is in the type of:

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

What does this PR do?

Fixed issues

#20559 #17955

Details

Before: What was the problem?

symbolRotate for legend is neither inherited nor being set in case of scatter series.

After: How does it behave after the fixing?

symbolRotate work well in legend

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

[github-actions[bot]]

The changes brought by this PR can be previewed at: https://echarts.apache.org/examples/editor?version=PR-20562@3af0b83