[bug] a problem with theme overide for trailing + freeze rows

Hello

I have this set of props for the Grid
```tsx
trailingRowOptions={{
hint: "Add..",
sticky: true,
tint: true,
}}
freezeTrailingRows={data.length > 0 ? 1 : 0}
getRowThemeOverride={(rowI) => {
if (rowI === data.length) {
return {
bgCell: "#efeff1",
};
}
return undefined;
}}
```

As you can see in the attached screenshot, the background color from the small row divider overlaps the text in the cells in the frozen row.

Maybe I can disable this row divider?