Remove GPL in About Nexus

src/about.rs

@@ -46,12 +46,7 @@ Nexus Network {}
 Desktop System Tray UI
 (c)2021-2026 Nexus Network, Inc.
 
-Released under the terms of the Mozilla Public License V2.0 (MPL)
-
-This UI application contains the following additional open source software:
-
- * https://github.com/zserge/tray by Serge Zaitsev (with modifications)
- * https://github.com/libui-ng/libui-ng by Pietro Gagliardi and others",
+",
             version
         ))
         .unwrap();