Fix #3888 by not adding position: relative. It is already defined in class and there are situations it needs to be overriden (#3890)

Author: vnbaaij

src/Core/Components/DataGrid/FluentDataGrid.razor.js

@@ -192,7 +192,6 @@ export function enableColumnResizing(gridElement) {
 
         const div = createDiv(tableHeight, isRTL);
         header.appendChild(div);
-        header.style.position = 'relative';
         setListeners(div, isRTL);
     });