Update a11y test output

testsuite/a11y/messagedialog.txt

@@ -16,6 +16,46 @@ window1
     <AtkComponent>
     layer: widget
     alpha: 1
+     
+      "label"
+      parent: unnamed-GtkContainerAccessible-0
+      index: 0
+      name:  
+      state: enabled multi-line sensitive showing visible
+      toolkit: gtk
+      <AtkComponent>
+      layer: widget
+      alpha: 1
+      <AtkText>
+      text:  
+      character count: 1
+      caret offset: 0
+      default attributes: bg-color: <omitted>
+                          bg-full-height: 0
+                          direction: <omitted>
+                          editable: false
+                          family-name: <omitted>
+                          fg-color: <omitted>
+                          indent: 0
+                          invisible: false
+                          justification: left
+                          language: <omitted>
+                          left-margin: 0
+                          pixels-above-lines: 0
+                          pixels-below-lines: 0
+                          pixels-inside-wrap: 0
+                          right-margin: 0
+                          rise: 0
+                          scale: 1
+                          size: <omitted>
+                          stretch: <omitted>
+                          strikethrough: false
+                          style: <omitted>
+                          underline: none
+                          variant: <omitted>
+                          weight: <omitted>
+                          wrap-mode: word
+      <AtkHypertext>
   dialog-vbox1
     "filler"
     parent: window1