Update cmpinfo->num_preset_events properly
Update cmpinfo->num_preset_events properly

This value wasn't being set if we were reading the
presets directly from the CSV file.

pyrovski/papi,pyrovski/papi,pyrovski/papi,pyrovski/papi,pyrovski/papi,arm-hpc/papi,pyrovski/papi,arm-hpc/papi,arm-hpc/papi,arm-hpc/papi,arm-hpc/papi,arm-hpc/papi,pyrovski/papi,pyrovski/papi,arm-hpc/papi