Merge branch 'scalandr/fix_submeso_standalone' (PR #5892)

Fix for submesoscale parametrization in standalone

At the moment, the submesoscale parametrization does not work properly
in MPAS-O standalone, that is even if
   config_submesoscale_enable = .true.
the parametrization is not active. To solve this issue, the subroutine
ocn_submesoscale_compute_velocity() has to called in
src/mode_forward/mpas_ocn_forward_mode.F.

[BFB]

components/mpas-ocean/src/mode_forward/mpas_ocn_forward_mode.F

@@ -711,8 +711,12 @@ function ocn_forward_mode_run(domain) result(ierr)!{{{
 
            call ocn_eddy_compute_mixed_layer_depth(statePool, forcingPool)
            if (config_use_GM .or. config_submesoscale_enable) then
-               call mpas_timer_start("submesoscale eddy velocity compute", .false.)
                call ocn_eddy_compute_buoyancy_gradient()
+           end if
+
+           if (config_submesoscale_enable) then
+               call mpas_timer_start("submesoscale eddy velocity compute", .false.)
+               call ocn_submesoscale_compute_velocity()
                call mpas_timer_stop("submesoscale eddy velocity compute")
            end if