API class isn't overridden when specified

[lat9]

Even though the class override is loaded, the version instantiated is still the default:

upsoauth/includes/modules/shipping/upsoauth.php

Lines 298 to 301 in 6c83752

	if (!class_exists(MODULE_SHIPPING_UPSOAUTH_API_CLASS)) {
	require DIR_WS_MODULES . 'shipping/upsoauth/' . MODULE_SHIPPING_UPSOAUTH_API_CLASS . '.php';
	}
	$this->upsApi = new UpsOAuthApi(MODULE_SHIPPING_UPSOAUTH_MODE, $this->debug, $this->logfile);