Update sfincs.py

[Leynse]

• Xarray.rename input type seems to have changed
• Only relevant for precip_2D and press_2D? (or more?)

[DirkEilander]

As discussed with @Leynse via chat, I think this issue is caused by the fact that the method is called with a xarray.Dataset instead of xarray.DataArray object for the precip and press arguments. These arguments were not clipped or filtered in the released HydroMT DataCatalog.get_rasterdataset functionality, but this has been solved in Deltares/hydromt#481. Now when given a dataset and then parsing it with e.g. DataCatalog.get_rasterdataset(variables=['precip'] it should only return the precip variable as DataArray, Hence I think this fix is not necessary.