[libadwaita/wip/exalm/demo] preferences-window: Remove the welcome label

[Alexander Mikhaylenko <alexm src gnome org>]

commit e78d5b5735c4baf97983e0cdd66df1313fd878f6
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Wed Oct 13 16:46:09 2021 +0500

    preferences-window: Remove the welcome label
    
    It doesn't serve any purposes.

 demo/adw-demo-preferences-window.ui | 19 -------------------
 1 file changed, 19 deletions(-)
---
diff --git a/demo/adw-demo-preferences-window.ui b/demo/adw-demo-preferences-window.ui
index 7c4cfb72..d4beef59 100644
--- a/demo/adw-demo-preferences-window.ui
+++ b/demo/adw-demo-preferences-window.ui
@@ -9,25 +9,6 @@
         <property name="icon_name">preferences-window-layout-symbolic</property>
         <property name="title">L_ayout</property>
         <property name="use-underline">True</property>
-        <child>
-          <object class="AdwPreferencesGroup">
-            <child>
-              <object class="AdwPreferencesRow">
-                <property name="title" bind-source="welcome_label" bind-property="label" 
bind-flags="sync-create"/>
-                <child>
-                  <object class="GtkLabel" id="welcome_label">
-                    <property name="ellipsize">end</property>
-                    <property name="label" translatable="yes">This is a preferences window</property>
-                    <property name="margin-top">12</property>
-                    <property name="margin-bottom">12</property>
-                    <property name="margin-start">12</property>
-                    <property name="margin-end">12</property>
-                  </object>
-                </child>
-              </object>
-            </child>
-          </object>
-        </child>
         <child>
           <object class="AdwPreferencesGroup">
             <property name="description" translatable="yes">Preferences are organized in pages, this example 
has the following pages:</property>