hide tabs in account creation wizard

data/glade/account_creation_wizard_window.glade

@@ -14,6 +14,7 @@
         <child>
           <widget class="GtkNotebook" id="notebook">
             <property name="visible">True</property>
+            <property name="show_tabs">False</property>
             <property name="show_border">False</property>
             <child>
               <widget class="GtkVBox" id="vbox78">