make PHP 7 compatible

application/component/oeusercomponent.php

@@ -36,7 +36,7 @@ class oeUserComponent extends oeUserComponent_parent
         $trace = ob_get_contents();
         ob_end_clean();
 
-        if(str_contains($trace, 'initAmazonPayExpress'))
+        if(strpos($trace, 'initAmazonPayExpress') !== false)
         {
             return parent::createUser();
         }