UWheeledVehicleMovementComponent no longer contains an IsFalling variable

UWheeledVehicleMovementComponent no longer has an IsFalling variable. It originally inherited from UPawnMovementComponent which it gained this variable from but now inherits directly from UMovementComponent instead.

Regression?: Yes
This did not occur in 4.13.2
This does occur in 4.14.0

1. Create a project based off the Advanced Vehicle Template
2. Open the vehicle's blueprint
3. Try to get IsFalling
   Result: There is no IsFalling boolean variable
   Expected: There should be an IsFalling boolean varaible

Fix UE-51650

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