Syntax fix

thats the reason why the helis where not added :P
Updated Trader Category
Added trade_any_vehicle_free

For buy unlocked vehicles (without getting a key)
Merge pull request #1079 from Fank/patch-2

Syntax fix
Merge pull request #1080 from Fank/patch-5

Updated Trader Category
Merge pull request #1081 from Fank/TradeUnlockVehicle

Added trade_any_vehicle_free
duplicate compile lines code