[gtk/wip/exalm/caption] widget-factory: Fix caption style class name

[Alexander Mikhaylenko <alexm src gnome org>]

commit 2abee57421481d92e626e158a2c926b26ab9a5e4
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Tue Nov 17 13:16:47 2020 +0500

    widget-factory: Fix caption style class name
    
    It's lowercase.

 demos/widget-factory/widget-factory.ui | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/demos/widget-factory/widget-factory.ui b/demos/widget-factory/widget-factory.ui
index 06f1581e1c..86ebe5c81a 100644
--- a/demos/widget-factory/widget-factory.ui
+++ b/demos/widget-factory/widget-factory.ui
@@ -1145,7 +1145,7 @@ Suspendisse feugiat quam quis dolor accumsan cursus.</property>
                                     <child>
                                       <object class="GtkLabel">
                                         <property name="label">Caption</property>
-                                        <style><class name="Caption"/></style>
+                                        <style><class name="caption"/></style>
                                       </object>
                                     </child>
                                   </object>