[SMF] Decrease sessions metric on OLD Session Release #2381
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Since redesign of fivegs_smffunction_sm_sessionnbr gauge, the metric doesn't expose some decrements. The decreasing of gauge had been moved out of function stats_remove_smf_session.
It should be decreased every time stats_remove_smf_session is called, but this particular case is easily reproducible by killing UPF while the session is established.