WebUI tests: Fix login screen loading issue
test_webui/test_loginscreen fails because login screen is rendered with delays.
To solve the issue small pause added after login.
Ticket: https://pagure.io/freeipa/issue/8053
Signed-off-by: Serhii Tsymbaliuk <stsymbal@redhat.com>
Reviewed-By: François Cami <fcami@redhat.com>