FIX wrong basePath in the swagger view

Behind a reverse proxy the basePath seems to be in http.
Forcing the basePath to DOL_MAIN_URL_ROOT fixes the problem.

htdocs/api/class/api.class.php

@@ -56,7 +56,7 @@ class DolibarrApi
         $this->db = $db;
         $production_mode = ( empty($conf->global->API_PRODUCTION_MODE) ? false : true );
         $this->r = new Restler($production_mode, $refreshCache);
-
+	$this->r->setBaseUrls(DOL_MAIN_URL_ROOT);
         $this->r->setAPIVersion(1);
     }