Fix regression: allow entering non custom mode for movements on Gym Pal

until recently, you could pick from options for weights when building a workout: Hypertrophy/Strength/Endurance : specify rep max, number, delay Custom: specify weight and reps obviously storing RM usually makes make more sense than hard coding a weight, but this feature was removed silently for Gym Pal only. ot continues to work in pre-existing workouts but I can't build new ones.