[gnome-control-center] user-accounts: Drop unused subtitle in "Account Activity" dialog

[Felipe Borges <felipeborges src gnome org>]

commit f56c90b91639529d162f4f0279fe23f61c07ce9a
Author: Felipe Borges <felipeborges gnome org>
Date:   Mon Jul 11 21:32:38 2016 +0200

    user-accounts: Drop unused subtitle in "Account Activity" dialog
    
    https://bugzilla.gnome.org/show_bug.cgi?id=767065

 panels/user-accounts/data/history-dialog.ui |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/panels/user-accounts/data/history-dialog.ui b/panels/user-accounts/data/history-dialog.ui
index dc2432d..1f17d7a 100644
--- a/panels/user-accounts/data/history-dialog.ui
+++ b/panels/user-accounts/data/history-dialog.ui
@@ -15,7 +15,6 @@
         <property name="visible">True</property>
         <property name="can_focus">False</property>
         <property name="title" translatable="yes">Login History</property>
-        <property name="subtitle" translatable="yes">Login History</property>
         <property name="show_close_button">True</property>
         <child>
           <object class="GtkBox">