Fixed vehicle spawning function not reducing CP according to cost

Previously would always decrease CP pool by four CP due to Copy-paste
error. Now it actually does reduce CP pool by passed parameter.

Author: ultranoobian

source/dialog/spawnVehicle.sqf

@@ -2,7 +2,7 @@ _requiredPoints = _this select 0;
 _vehicleType = _this select 1;
 
 if (commandpointsblu1 >= _requiredPoints) then {
-    commandpointsblu1 = commandpointsblu1 - 4;
+    commandpointsblu1 = commandpointsblu1 - _requiredPoints;
     ctrlSetText [1000, format["%1",commandpointsblu1]];
     _spawnPos = (getpos hq_blu1) findEmptyPosition [40, 120, _vehicleType];
     _spawnPos = [(_spawnPos select 0), _spawnPos select 1];