AutoTest: Shuffle namespaces for clearer separation

Change-Id: I6ac440c6d72c3d0dbcd75907f8a6ae756f3cf5ee
Reviewed-by: hjk <hjk@qt.io>

src/plugins/autotest/testnavigationwidget.h

@@ -47,9 +47,11 @@ class ProgressIndicator;
 }
 
 namespace Autotest {
-namespace Internal {
 
 class TestTreeModel;
+
+namespace Internal {
+
 class TestTreeSortFilterModel;
 class TestTreeView;