[charts] Remove unused fill and stroke properties

[sai6855]

closes #18812

[mui-bot]

Deploy preview: https://deploy-preview-19316--material-ui-x.netlify.app/

Bundle size report

Bundle	Parsed size	Gzip size
@mui/x-data-grid	0B(0.00%)	0B(0.00%)
@mui/x-data-grid-pro	0B(0.00%)	0B(0.00%)
@mui/x-data-grid-premium	0B(0.00%)	0B(0.00%)
@mui/x-charts	0B(0.00%)	0B(0.00%)
@mui/x-charts-pro	0B(0.00%)	0B(0.00%)
@mui/x-date-pickers	0B(0.00%)	0B(0.00%)
@mui/x-date-pickers-pro	0B(0.00%)	0B(0.00%)
@mui/x-tree-view	0B(0.00%)	0B(0.00%)
@mui/x-tree-view-pro	0B(0.00%)	0B(0.00%)

Details of bundle changes

Generated by 🚫 dangerJS against 5b4ceef

[codspeed-hq]

CodSpeed Performance Report

Merging #19316 will not alter performance

_{Comparing sai6855:remove-fill (5b4ceef) with master (a937dc5)¹}

Summary

✅ 10 untouched benchmarks

Footnotes

1. No successful run was found on master (e25895d) during the generation of this report, so a937dc5 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩