Add more safety to the fullscreen for Archiver

We can't really just hit super-up and then immediately go on our
merry way clicking on stuff...

Signed-off-by: Adam Williamson <awilliam@redhat.com>

tests/applications/archiver/aaa_setup.pm

@@ -23,7 +23,8 @@ sub run {
     # Check it has started
     assert_screen 'apps_run_files';
     # Fullsize the window.
-    send_key("super-up");
+    wait_screen_change { send_key("super-up"); };
+    wait_still_screen 3;
 
     # Open the Documents directory
     assert_and_click("gnome_open_location_documents");