[gtk] about dialog: Use ::activate-link for license

[Matthias Clasen <matthiasc src gnome org>]

commit 28241cecff72dda20d72f1489e054897aa25655a
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Jan 15 23:16:16 2019 -0500

    about dialog: Use ::activate-link for license
    
    This should behave the same as all the other links
    in this dialog.
    
    Closes: #1561

 gtk/ui/gtkaboutdialog.ui | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gtk/ui/gtkaboutdialog.ui b/gtk/ui/gtkaboutdialog.ui
index 180151f66e..f698c758b9 100644
--- a/gtk/ui/gtkaboutdialog.ui
+++ b/gtk/ui/gtkaboutdialog.ui
@@ -98,6 +98,7 @@
                         <property name="wrap">1</property>
                         <property name="selectable">1</property>
                         <property name="max-width-chars">60</property>
+                        <signal name="activate-link" handler="emit_activate_link" object="GtkAboutDialog" 
swapped="yes"/>
                       </object>
                     </child>
                   </object>