Fix internal formatting error from set_grid_metrics()

- In #198, @nicjhan reported problems running OM4_025 with intel
  compiler in debug mode. This fixes the "output conversion error,
  unit -5, file Internal Formatted Write: error mentioned in that
  issue for MOM.
- No answer changes.

src/initialization/MOM_grid_initialize.F90

@@ -494,8 +494,8 @@ subroutine set_grid_derived_metrics(G, param_file)
     G%IareaBu(I,J) = G%IdxBu(I,J) * G%IdyBu(I,J)
   enddo ; enddo
 
-68 FORMAT ("WARNING: PE ",I4," ",a4,"(",I4,",",I4,") = ",ES10.4, &
-           " is being changed to ",ES10.4,".")
+68 FORMAT ("WARNING: PE ",I4," ",a4,"(",I4,",",I4,") = ",ES12.4, &
+           " is being changed to ",ES12.4,".")
 
   call callTree_leave("set_grid_derived_metrics()")
 end subroutine set_grid_derived_metrics