Generalizes name for default alerts endpoint/recipient

Addresses #6076

scripts/plugins/endpoints/sqlite_alert_endpoint/manifest.lua

@@ -1,16 +0,0 @@
---
--- (C) 2019-21 - ntop.org
---
-
--- This file contains the plugin metadata information.
-
--- NOTE: Plugins are loaded at startup, any change to this plugin
--- can be applied by restarting ntopng or by manually reloading the
--- plugins from http://127.0.0.1:3000/lua/plugins_overview.lua .
-
-return {
-  title = "SQLite Alert Endpoint",
-  description = "Handles SQLite alert notifications for the UI",
-  author = "ntop",
-  dependencies = {},
-}