Re-add observer to UH1Y and AH6X

This fixes config errors for unknown animation sources for both
vehicles. The turrets do not have thermal capabilities and this restores
the missing co-pilot/observer seat in the UH1Y. Also I can't seem to get
the turret on the AH6X to rotate, but if someone knows how please leave
a comment or commit the changes. there's currently no overlay for the
observer of the AH6X since it can't move I feel it's limited enough
without an overlay like the UH1Y.

SQF/dayz_code/Configs/CfgVehicles/CfgVehicles.hpp

@@ -389,6 +389,7 @@ class CfgVehicles {
 	//class UAZ_Unarmed_Base;
 	//class HMMWV_Base;
 	class AH6_Base_EP1;
+	class AH6X_EP1;
 	class An2_Base_EP1;
 	class TT650_Base;
 	class V3S_Base;