NRM/RRO 422 Freeroam Spawn Listing FIx

A small fix for the issue where the NRM 422 and the RRO 422 were grouped together in the train spawn menu.
This mod simply adds "NRM" to the friendly name of the 422's end cars ("BR422 DB"), enabling a seperation of it from the RRO 422 so it has its own train entry in the said spawn menu.

(Explanation: the RRO 422's friendly name was also "BR422 DB", resulting in both versions getting grouped together.)

Note for other modders (might be of interest regarding compatibility):
This mod only affects the RVD_NRM_DB_BR422_FrontCabUnit and RVD_NRM_DB_BR422_RearCabUnit assets in NRM_DB_BR422\Content\Data\RailVehicleDefinition. Nothing else besides the friendly names has been changed.