tests/functional/test_arm_quanta_gsj: Fix broken test

ASSET_IMAGE needs to be prefixed with "self." ... this bug
apparently went in unnoticed because the test is not run by
default.

Message-ID: <20250102073403.36328-1-thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>
1 file changed