Fixed title of layouts window

ubinstall-gtk-keyboard.glade

@@ -1,7 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!-- Generated with glade 3.38.2 -->
-<interface>
+<interface domain="ubinstall-gtk">
   <requires lib="gtk+" version="3.24"/>
+  <!-- interface-css-provider-path ubinstall-gtk.css -->
   <object class="GtkWindow" id="MainWindow">
     <property name="width-request">200</property>
     <property name="height-request">400</property>