Fixed jumping in air bug

Author: jackyyzhang03

traits/jump.py

@@ -8,7 +8,7 @@ def __init__(self, entity):
 
     def jump(self, jumping):
         if jumping:
-            if not self.entity.inAir and not self.entity.inJump:  # redundant check
+            if self.entity.onGround:
                 self.entity.sound.play_sfx(self.entity.sound.jump)
                 self.entity.vel.y = self.verticalSpeed
                 self.entity.inAir = True