bugfix for fgrg_rofi computation

[mvertens]

Description of changes

bugfix for fgrg_rofi computation
Thanks to @billsacks who discovered this issue!

Specific notes

The current logic for DGCL%NOEVOLVE for exporting Fgrg_rofi is the following:

       if (initialized_noevolve) then
          ! Compute Fgrg_rofi
          do ns = 1,num_icesheets
              do ng = 1,size(Fgrg_rofi(ns)%ptr)
                 Fgrg_rofi(ns)%ptr(ng) = Flgl_qice(ns)%ptr(ng)
              end do
           end do
         end if

However, what Fgrg_rofi should only be exported if is_in_active_grid(usrf(ng)) is true. And the code should be the following:

       if (initialized_noevolve) then
          ! Compute Fgrg_rofi
          do ns = 1,num_icesheets
             do ng = 1,lsize(Fgrg_rofi(ns)%ptr)
                if (is_in_active_grid(usrf(ng))) then
                   Fgrg_rofi(ns)%ptr(ng) = Flgl_qice(ns)%ptr(ng)
                else
                   Fgrg_rofi(ns)%ptr(ng) = 0._r8
                end if
             end do
          end do
       endif

Note - since by default in coupled runs DGC%NOEVOLVE only sends new Fgrg_rofi back yearly - comparisons with previous runs will show no answer changes until the second year of the run.

Contributors other than yourself, if any: @billsacks

CDEPS Issues Fixed: #294

Are there dependencies on other component PRs (if so list): No

Are changes expected to change answers: Answer will differ after the first coupling period where valid data is received by DGLC (by default this is one year).

Any User Interface Changes (namelist or namelist defaults changes): No

Testing performed (e.g. aux_cdeps, CESM prealpha, etc): This was discovered and resolved in a NorESM case using the compset and grid:

1850_CAM%DEV%LT%NORESM%CAMoslo_CLM51%SP_CICE_BLOM%ECO_MOSART_DGLC%NOEVOLVE_SWAV_SESP

a%ne30np4.pg3_l%ne30np4.pg3_oi%tnx1v4_r%r05_w%null_z%null_g%gris4_m%tnx1v4

So this should apply equally to CESM cases.

Hashes used for testing:
CDEPS: cdeps1.0.44 (with dglc_datamode_noevolve_mod.F90 bug fix)
CMEPS: cmeps1.0.13 (with med_diag_mod.F90 bug fix)

[billsacks]

Thanks, @mvertens !