[GEN][ZH] Prevent unlikely buffer overrun while writing to 'newPts' in PolygonTrigger::reallocate()

[xezon]

This change prevents an unlikely buffer overrun while writing to 'newPts' in PolygonTrigger::reallocate() and makes the compiler happy.

GeneralsMD\Code\GameEngine\Source\GameLogic\Map\PolygonTrigger.cpp(105): warning C6386: Buffer overrun while writing to 'newPts':  the writable size is 'm_sizePoints*12' bytes, but '24' bytes might be written.

[Caball009]

What warning settings are required to get a warning here? I can't replicate it, nor do I really understand what the warning is about.