Atmospheric guidance switches from pitch-program to min-AoA during UPFG preconvergence

[Noiredd]

If you configure your vehicle to follow a pitch program (which potentially flies at a high angle-of-attack at some point), this setting will be disregarded when PEGAS is about to switch to active guidance. Offender is line 935 in pegas_util.ks - since it wasn't changed to account for the new pitch program mode, it still assumes that the only correct way of flying in the atmosphere is min-AoA.

Solution: replace this with a call to atmosphericSteeringControl.