Remove unused cl_id

[JanStreffing]

This was used only in the old way for manually modifying lsm.

[fernandadialzira]

To better accomodate for the different number of variables to be modified without the need to disclose the cycle of openIFS/IFS, one of the stack rules is to check list of variables in ICMGG<exp_id>INIT:

var_list=['stl1', 'stl2', 'stl3', 'stl4', 'swvl1', 'swvl2', 'swvl3', 'swvl4', 'sd', 'src', 'skt', 
                'ci', 'lmlt', 'lmld', 'lblt', 'ltlt', 'lshf', 'lict', 'licd', 'tsn', 'asn', 'rsn', 
                'sst', 'istl1', 'istl2', 'istl3', 'istl4', 'chnk', 'lsm', 'sr', 'al', 'aluvp', 
                'alnip', 'aluvd', 'alnid', 'lai_lv', 'lai_hv', 'sdfor', 'slt', 'sdor', 'isor', 'anor', 
                'slor', 'lsrh', 'cvh', 'cvl', 'tvh', 'tvl', 'cl', 'dl']