Calculator: delay before snapshotting

In some tests on staging this seems to help with the 'clicks
don't work in later test steps' problem we're seeing a lot.

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

tests/applications/calculator/aaa_setup.pm

@@ -12,6 +12,8 @@ sub run {
     # Run the application
     menu_launch_type("Calculator");
     assert_screen("apps_run_calculator");
+    # wait for system to settle before snapshotting
+    sleep 10;
 }
 
 sub test_flags {