Fix stocking bug in VegStructUpdateMod

Fixes comical bug that emerged when stocking
density was moved out to pftvarcon - stocking
density being decreased by 10000 each time step,
causing vegetation to rapidly grow into space.

components/elm/src/biogeochem/VegStructUpdateMod.F90

@@ -116,9 +116,6 @@ subroutine VegStructUpdate(num_soilp, filter_soilp, &
 
       dt = real( get_rad_step_size(), r8 )
 
-      ! convert from stems/ha -> stems/m^2
-      stocking = stocking / 10000._r8
-
       ! patch loop
       do fp = 1,num_soilp
          p = filter_soilp(fp)