Fix ContentOverflow "In DataGrid" story: rows rendering at wrong height

[Copilot]

The Comet theme sets a global getRowHeight in MuiDataGrid defaultProps (returning 60px for standard density). The story used rowHeight={100}, but getRowHeight and rowHeight are separate props — getRowHeight wins per-row, so rows were 60px, not 100px. ContentOverflow relies on height: 100% internally, so it was undersized and misaligned within the cell.

Fix

• Replace rowHeight={100} with getRowHeight={() => 100} in the InDataGrid story. An explicit getRowHeight prop on the component overrides the theme's defaultProps.getRowHeight, ensuring rows are actually 100px.

- <DataGrid autoHeight rows={gridRows} columns={gridColumns} rowHeight={100} />
+ <DataGrid autoHeight rows={gridRows} columns={gridColumns} getRowHeight={() => 100} />

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