MAINTAINERS: Downgrade the functional testing section to "Odd Fixes"

I won't have that much time for QEMU anymore in the future, so downgrade the status of the "functional testing framework" section to "Odd Fixes" to avoid wrong expectations. While we're at it, also switch to my other e-mail address here that I'm already using for the other sections where I am still listed as maintainer / reviewer. Message-ID: <20260313113424.15583-5-thuth@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Thomas Huth <thuth@redhat.com>