Use transportLimit for unknown numberOrTemplate

Instead of directly using the numberOfTroops it should first check for the actual transport limit (if defined) for the given helo type. Otherwise the unitLoadLimits would be ignored for all AI flights automatically loading troops in pickup zones.

CTLD.lua

@@ -2121,7 +2121,7 @@ function ctld.loadTroops(_heli, _troops, _numberOrTemplate)
 
     --number doesnt apply to vehicles
     if _numberOrTemplate == nil  or (type(_numberOrTemplate) ~= "table" and type(_numberOrTemplate) ~= "number")  then
-        _numberOrTemplate = ctld.numberOfTroops
+        _numberOrTemplate = ctld.getTransportLimit(_heli:getTypeName())
     end
 
     if _onboard == nil then