vp9 resize_test: Enable resize_allowed in real-time ExternalResize test.

For dynamic resizing (whether the new codec size is determined internally
or externally set by user), we should for now keep rc.resize_allowed enabled.
This prevent the use of referene_masking for real-time mode
(in set_rt_speed_feature()).

Change-Id: Ibb7c3ff35be88afdf1a3c6db6693521766f177a3
1 file changed