desktop_printing: wait a bit after switching back from console

This test is failing a lot recently on KDE because when we try
to launch konsole immediately after returning from a console to
the desktop, it is mistyped and we get a browser instead. Let's
try a little sleep after the switch back in case KDE just needs
to settle down a bit.

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

tests/desktop_printing.pm

@@ -49,6 +49,9 @@ sub run {
         $term = "konsole";
     }
 
+    # give the desktop a few seconds to settle, we seem to be getting
+    # a lot of mis-types in KDE if we do not, as of 2024-02
+    wait_still_screen(3);
     # Let's open the terminal. We will use it to start the applications
     # as well as to check for the name of the printed file.
     menu_launch_type($term);