#981 Replace hfsnthermds with 2D version

Author: mo-jareddrayton

cdds/cdds/common/plugins/cmip7/data/grid_mapping/grids.cfg

@@ -496,7 +496,7 @@ hfgeou_ti-u-hxy-sea = ocean tripolar-native
 hfibthermds_tavg-ol-hxy-sea = ocean tripolar-native 
 hfrainds_tavg-u-hxy-ifs = ocean tripolar-native 
 hfrunoffds_tavg-ol-hxy-sea = ocean tripolar-native 
-hfsnthermds_tavg-ol-hxy-sea = ocean tripolar-native 
+hfsnthermds_tavg-u-hxy-sea = ocean tripolar-native 
 hfx_tavg-u-hxy-sea = ocean tripolar-ugrid 
 hfy_tavg-u-hxy-sea = ocean tripolar-vgrid 
 htovgyre_tavg-u-hyb-sea = ocean tripolar-native