fix(fallback): missing conversion from float to int

shiftregister/fallback/models.py

@@ -91,6 +91,7 @@ class TeamMember(models.Model):
         extra_chance, shift_count = math.modf(
             min(max_shifts_per_member, shifts_per_member)
         )
+        shift_count = int(shift_count)
         if extra_chance > random():
             shift_count += 1