Unnecessary restrictions for nn_fsbc(child) in AGRIF zoom without ice-model

Without sea-ice model in an AGRIF zoom (nn_ice(child) = 0 ; see also: #30 (closed)) restrictions for nn_fscb(child) due to the ice model are unnecessary. These are part of subroutine Agrif_InitValues_cont_ice which in this case does not need to be called at all.

Proposition: change call in agrif_user.F90 line 42 to

IF( nn_ice /= 0) CALL Agrif_InitValues_cont_ice

Furthermore, I think in this case, CALL Agrif_Declare_Var_ice in icestp.F90 is also unnecessary. I'm however unsure about the respective call in sbcmod.F90

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