added init for dayz_myLiftVehicle

dayz_myLiftVehicle removeAction s_player>
Error position: <dayz_myLiftVehicle removeAction s_player>
Error Undefined variable in expression: dayz_myliftvehicle
File z\addons\dayz_code\compile\fn_selfActions.sqf, line 48

SQF/dayz_code/init/variables.sqf

@@ -709,6 +709,7 @@ if(!isDedicated) then {
 	DZE_FreshSpawn = false;
 
 	DZE_myHaloVehicle = objNull;
+	dayz_myLiftVehicle = objNull;
 
 	DZE_Friends = [];