tests: Don't print selection count

Selection count is tested via assertions and can be inferred from
looking at the number of selected children.

And I'd like to reduce the output of the tests. We're outputting way too
much anyway.

tests/a11y/about.txt

@@ -86,7 +86,6 @@ window1
         layer: widget
         alpha: 1
         <AtkSelection>
-        selection count: 1
         selected children: unnamed-GailNotebookPage-4
         unnamed-GailNotebookPage-4
           "page tab"

tests/a11y/accessibility-dump.c

@@ -393,9 +393,9 @@ dump_atk_selection (AtkSelection *atk_selection,
   guint n_selections, n_counted_selections;
   gint i;
 
-  n_selections = atk_selection_get_selection_count (atk_selection);
   g_string_append_printf (string, "%*s<AtkSelection>\n", depth, "");
-  g_string_append_printf (string, "%*sselection count: %d\n", depth, "", n_selections);
+
+  n_selections = atk_selection_get_selection_count (atk_selection);
 
   n_counted_selections = 0;
   for (i = 0; i < atk_object_get_n_accessible_children (ATK_OBJECT (atk_selection)); i++)
@@ -418,6 +418,7 @@ dump_atk_selection (AtkSelection *atk_selection,
     }
   
   g_assert_cmpint (n_selections, ==, n_counted_selections);
+  g_assert_cmpint (n_selections, ==, atk_selection_get_selection_count (atk_selection));
 }
 
 static void

tests/a11y/appchooser.txt

@@ -101,7 +101,6 @@ window1
               layer: widget
               alpha: 1
               <AtkSelection>
-              selection count: 0
               <AtkTable>
               rows: 1
               columns: 1

tests/a11y/iconview.txt

@@ -16,7 +16,6 @@ window1
     layer: widget
     alpha: 1
     <AtkSelection>
-    selection count: 0
     One
       "icon"
       parent: iv1

tests/a11y/notebook.txt

@@ -16,7 +16,6 @@ window1
     layer: widget
     alpha: 1
     <AtkSelection>
-    selection count: 1
     selected children: Tab 1
     Tab 1
       "page tab"

tests/a11y/pickers.txt

@@ -82,7 +82,6 @@ window1
         <AtkAction>
         action 0 name: press
         <AtkSelection>
-        selection count: 0
         unnamed-GailMenu-1
           "menu"
           parent: unnamed-GailComboBox-0
@@ -93,7 +92,6 @@ window1
           layer: popup
           alpha: 1
           <AtkSelection>
-          selection count: 0
           unnamed-GailMenuItem-2
             "menu item"
             parent: unnamed-GailMenu-1
@@ -282,7 +280,6 @@ window1
       <AtkAction>
       action 0 name: press
       <AtkSelection>
-      selection count: 0
       unnamed-GailMenu-8
         "menu"
         parent: button1
@@ -293,4 +290,3 @@ window1
         layer: popup
         alpha: 1
         <AtkSelection>
-        selection count: 0

tests/a11y/tree.txt

@@ -16,7 +16,6 @@ window1
     layer: widget
     alpha: 1
     <AtkSelection>
-    selection count: 2
     selected children: One
                        Two
     <AtkTable>