🐛 [BUG] Legend focus not working correct on DualAxis charts

[juergenr]

Legend focus not working correct on DualAxis charts initially.

Reproduce:

1. Copy "Dual multi line-Example" and add legend : { radio : true }
2. Click on a focus button (radio) in the legend
3. Result: Only graphs of the current axis are deselected. Expected Result: All other graphs will be deselected.
4. Remark: After clicking on different focus buttons on graphs of both axis, all works correct

Bug-Demo

• G2Plot Version: 2.4.20
• Platform: All, including example page