Related fdo#67642: remove redundant 'Preferences' label to save some space

This label is redundant now that the dialog has a title.

Change-Id: I628cc99594f7c42e9484f31d64779881e17c8f02
Reviewed-on: https://gerrit.libreoffice.org/10119Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

cui/uiconfig/ui/aboutconfigdialog.ui

 <?xml version="1.0" encoding="UTF-8"?>
+<!-- Generated with glade 3.16.1 -->
 <interface>
-  <!-- interface-requires gtk+ 3.0 -->
+  <requires lib="gtk+" version="3.0"/>
   <!-- interface-requires LibreOffice 1.0 -->
   <object class="GtkDialog" id="AboutConfig">
     <property name="can_focus">False</property>
@@ -96,19 +97,11 @@
           </packing>
         </child>
         <child>
-          <object class="GtkFrame" id="frame1">
+          <object class="GtkAlignment" id="alignment1">
             <property name="visible">True</property>
             <property name="can_focus">False</property>
             <property name="hexpand">True</property>
             <property name="vexpand">True</property>
-            <property name="label_xalign">0</property>
-            <property name="shadow_type">none</property>
-            <child>
-              <object class="GtkAlignment" id="alignment1">
-                <property name="visible">True</property>
-                <property name="can_focus">False</property>
-                <property name="top_padding">6</property>
-                <property name="left_padding">12</property>
             <child>
               <object class="GtkBox" id="box1">
                 <property name="visible">True</property>
@@ -202,18 +195,6 @@
               </object>
             </child>
           </object>
-            </child>
-            <child type="label">
-              <object class="GtkLabel" id="label1">
-                <property name="visible">True</property>
-                <property name="can_focus">False</property>
-                <property name="label" translatable="yes">Preferences</property>
-                <attributes>
-                  <attribute name="weight" value="bold"/>
-                </attributes>
-              </object>
-            </child>
-          </object>
           <packing>
             <property name="expand">False</property>
             <property name="fill">True</property>