dbus-test: Remove EXTRA_OECONF_X configs

X specific configs are already handled through PACKAGECONFIG:
PACKAGECONFIG ??= "${@bb.utils.filter('DISTRO_FEATURES', 'systemd x11', d)}"
...
PACKAGECONFIG[x11] = "--with-x --enable-x11-autolaunch,--without-x
                      --disable-x11-autolaunch, virtual/libx11 libsm"

Remove duplicated EXTRA_OECONF_X args.

(From OE-Core rev: 7dc107b0)

Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 036e3436e51a44de3fc9b4b8e5b1ff149e3aaa9d)
Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>