[libhandy] demo: Set a minimum width of 360px

[Alexander Mikhaylenko <alexm src gnome org>]

commit c6559a5e34bdd662563ad4e0ec73efd779eba98a
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Fri Aug 7 08:07:21 2020 +0200

    demo: Set a minimum width of 360px
    
    There is no point going below and it will help figuring out what's the
    width on phones.

 examples/hdy-demo-window.ui | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/examples/hdy-demo-window.ui b/examples/hdy-demo-window.ui
index 36fe1d52..aaf56504 100644
--- a/examples/hdy-demo-window.ui
+++ b/examples/hdy-demo-window.ui
@@ -22,6 +22,7 @@
         <property name="visible">True</property>
         <property name="can_focus">False</property>
         <property name="can-swipe-back">True</property>
+        <property name="width-request">360</property>
         <child>
           <object class="GtkBox">
             <property name="visible">True</property>