[libhandy] demo: Use the default HdyClamp prop values

[Alexander Mikhaylenko <alexm src gnome org>]

commit 218afcfa0945dce3c01688b741506a7cb95a0b1e
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Wed Jun 17 08:40:15 2020 +0200

    demo: Use the default HdyClamp prop values
    
    There is no point in specifying them anymore.

 examples/hdy-demo-window.ui | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/examples/hdy-demo-window.ui b/examples/hdy-demo-window.ui
index 20989fd5..e503ea5a 100644
--- a/examples/hdy-demo-window.ui
+++ b/examples/hdy-demo-window.ui
@@ -1442,7 +1442,6 @@
                               <object class="HdyClamp">
                                 <property name="visible">True</property>
                                 <property name="hexpand">True</property>
-                                <property name="maximum-size">600</property>
                                 <child>
                                   <object class="GtkSearchEntry" id="search_entry">
                                     <property name="visible">True</property>