[gnome-system-monitor] Fix GPL 2+ text

[Robert Roth <robertroth src gnome org>]

commit e20993ad6b8abfdebb0b7e936416164b5f30ce3d
Author: Sabri Ünal <libreajans gmail com>
Date:   Sun Feb 9 18:50:29 2020 +0000

    Fix GPL 2+ text
    
    Close licence tab and add standard GPL 2 license link.

 src/interface.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/src/interface.cpp b/src/interface.cpp
index b705c9e9..eb4efadf 100644
--- a/src/interface.cpp
+++ b/src/interface.cpp
@@ -395,8 +395,7 @@ on_activate_about (GSimpleAction *, GVariant *, gpointer data)
         "artists",              artists,
         "documenters",          documenters,
         "translator-credits",   _("translator-credits"),
-        "license",              "GPL 2+",
-        "wrap-license",         TRUE,
+               "license-type",                 GTK_LICENSE_GPL_2_0,
         NULL
         );
 }