Fix air dragging value.

Author: D8H

examples/360°-platformer/360°-platformer.json

@@ -1249,7 +1249,7 @@
               "Gravity": 2362.5,
               "MaxFallingSpeed": 1440,
               "CeilBounceFactor": 0,
-              "AirDrag": 0,
+              "AirDrag": 0.03125,
               "AirDragMinSpeedY": -720,
               "AirAcceleration": 1012.5,
               "GroundAcceleration": 506.25,