Marine vrfy needs to have bkgerr for seaice

[apchoiCMD]

Throughout several verify tasks for Marine Test;

bkgerr for seaice is needed to plot for every cycle along with bkgerr foe ocean
Mimic what bkg has for ice below

plotConfig(grid_file=grid_file,
                             data_file=os.path.join(com_ice_history, f'{RUN}.ice.t{gcyc}z.inst.f006.nc'),
                             variables_horiz={'aice_h': [0.0, 1.0],
                                              'hi_h': [0.0, 4.0],
                                              'hs_h': [0.0, 0.5]},
                             colormap='jet',
                             projs=['North', 'South', 'Global'],
                             comout=os.path.join(comout, 'vrfy', 'bkg')),   # sea ice background