Windows: Call SetThreadStackGuarantee for all threads, not just main thread

src/openttd.cpp

@@ -685,6 +685,7 @@ static const OptionData _options[] = {
 int openttd_main(int argc, char *argv[])
 {
 	SetSelfAsMainThread();
+	PerThreadSetup();
 	std::string musicdriver;
 	std::string sounddriver;
 	std::string videodriver;