ICE_AGRIF does not run if compiled with debug options

[smasson]

Context

same as #2421 but for r4.0-HEAD

jpk = 1 in ICE_AGRIF. This generates out-of-bounds in domzgr at this line

         bathy  (ji,jj) = gdepw_0(ji,jj,ikb+1)

Analysis

the model is not designed to ru with jpk = 1. It needs at least 2 levels to be able to define the surface and the bottom at W levels:

— W jk = 1 — surface
— T jk = 1 — 
— W jk = 2 — bottom
— T jk = 2 — 

Fix

define jpk = 2 in ICE_AGRIF/MY_SRC/usrdef_nam and remove a few small tricks added to run with jpk = 1

[smasson]

In 12598:

r4.0-HEAD: ice_agrif bugfix, see #2422

[smasson]

fixed in [12598]