[lens][datatable] Remove eui datagrid styles (elastic#204057)

## Summary

Removes additional styles to make table background transparent, as it
was directly removed in EUI v98.2.1-borealis.1.1
elastic#204783.

### Checklist

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Co-authored-by: Marta Bondyra <[email protected]>
(cherry picked from commit bdf496b)

x-pack/platform/plugins/shared/lens/public/visualizations/datatable/components/table_basic.scss

@@ -1,10 +1,5 @@
 .lnsDataTableContainer {
   height: 100%;
-
-  // EUI issue to make background transparent https://github.com/elastic/eui/issues/8136
-  .euiDataGrid__content {
-    background: transparent;
-  }
 }
 
 .lnsTableCell--multiline {