desktop_login: drop obsolete check for 'login failed' message

Up to F33 we could check that an error message was shown when we
tried to log in with the wrong password on GNOME, but since F34
it's transient and disappears too quick to reliably catch, so
we don't check it any more. Now F33 is EOL, drop the conditional.

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

tests/desktop_login.pm

@@ -230,16 +230,7 @@ sub run {
 
     # Try to log in with either account, intentionally entering the wrong password.
     login_user(user=>"jack", password=>"wrongpassword", checklogin=>0);
-    my $relnum = get_release_number;
-    if ($desktop eq "gnome" && $relnum < 34) {
-        # In GDM before F34, a message is shown about an unsuccessful login
-        # and it can be asserted, so let's do it. In SDDM and GDM F34+,
-        # there is also a message, but it is only displayed for a short
-        # moment and the assertion fails here,  so we will skip the assertion.
-        # Not being able to login in with a wrong password is enough here.
-        assert_screen "login_wrong_password";
-        send_key 'esc';
-    }
+    # get back to the login screen if necessary (dismiss an error message)
     send_key 'esc' unless (check_screen "login_jim");
 
     # Now, log into the system again using the correct password. This will