limpress: use esc not alt-f4 to close template chooser

See https://bugzilla.redhat.com/show_bug.cgi?id=2252806 for why,
we're working around that.

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

tests/apps_startstop/kde/limpress.pm

@@ -12,7 +12,7 @@ sub run {
     # Check that it is started
     assert_screen 'limpress_runs', timeout => 60;
     # Close the template chooser, then the application
-    send_key 'alt-f4';
+    send_key 'esc';
     quit_with_shortcut();
 }