CB_Wang

Results 2 issues of CB_Wang

distinguish the index `i` and the output `i` of `i_gate` in sLSTM

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![image](https://github.com/muditbhargava66/PyxLSTM/assets/49528065/972f5ee4-1d10-45e0-9fcf-911da1ce99a4)

fix bug in `sLSTM` and `mLSTM`, distinguish the index `ind_i` and `i_gate` output