DH_ArmoredWheeledVehicle: several functions simply restate inherited or add a bug

[Matt Hands]

Five overridden functions/state do nothing or introduce small bugs, so should be removed from this class:

KDriverLeave - overridden function actually removes correct handling if vehicle uses bSpecialExiting, giving incorrect "you must open hatch" message when there is no driver's hatch

KDriverEnter - overridden function only removes "if (!p.IsHumanControlled()) bEngineOff = false", which just lets bots start vehicle engine & seems perfectly valid

ServerChangeViewPoint, state ViewTransition & DenyEntry - overridden functions/state simply re-state inherited functions from DH_ROTreadCraft

[Matt Hands]

Fixed in commit c048049