fixed bom utils with new CSS for assembly

Author: ArmaanMehra

src/frontend/src/utils/bom.utils.ts

@@ -71,9 +71,9 @@ export const BomStyledDataGrid = styled(DataGrid)(({ theme }) => ({
     backgroundColor: '#ef4345'
   },
   '& .super-app-theme--assembly': {
-    backgroundColor: '#997570',
+    backgroundColor: theme.palette.grey[600],
     '&:hover': {
-      backgroundColor: '#997570'
+      backgroundColor: theme.palette.grey[700]
     },
     '&.Mui-selected': {
       backgroundColor: '#997570',