Fix UL-MCS when UL inactivity and no data
In develop, when UL inactivity and no data, min_grant_mcs is the maximum MCS value, instead of the minimum value. This MR fixes this bug in the UL-MCS calculation.
In develop, when UL inactivity and no data, min_grant_mcs is the maximum MCS value, instead of the minimum value. This MR fixes this bug in the UL-MCS calculation.