(legacy) align session_start and close in config.lib.inc

(cherry picked from commit d3827091)

src/etc/inc/config.lib.inc

@@ -175,9 +175,6 @@ function write_config($desc = 'Unknown', $backup = true)
 				return false;
 			}
 		}
-	}
-
-	if (!isset($argc)) {
 		session_write_close();
 	}