Extend temporal filter to speed 7 and 8

This change is for < 360p videos.
Borg test results on rtc_derf:
         avg_psnr:  ovr_psnr:   ssim:
speed 7:  -0.176     -0.074    -0.190
speed 8:  -0.397     -0.240    -0.356
Speed drop: <0.2%

STATS_CHANGED

Change-Id: I633cd5011c78ab4c37a2ca37672783b97a706318
diff --git a/av1/encoder/speed_features.c b/av1/encoder/speed_features.c
index bbda2eb..475cf3d 100644
--- a/av1/encoder/speed_features.c
+++ b/av1/encoder/speed_features.c
@@ -1269,6 +1269,7 @@
     if (speed >= 7) {
       sf->lpf_sf.cdef_pick_method = CDEF_PICK_FROM_Q;
       sf->rt_sf.check_only_zero_zeromv_on_large_blocks = true;
+      sf->rt_sf.use_rtc_tf = 2;
     }
     if (speed == 8) sf->rt_sf.prefer_large_partition_blocks = 1;
     if (speed >= 8) {
@@ -1279,7 +1280,6 @@
       sf->rt_sf.use_comp_ref_nonrd = 0;
       sf->rt_sf.nonrd_agressive_skip = 1;
       sf->rt_sf.skip_intra_pred = 1;
-      sf->rt_sf.use_rtc_tf = 2;
       // Only turn on enable_ref_short_signaling for low resolution when only
       // LAST and GOLDEN ref frames are used.
       sf->rt_sf.enable_ref_short_signaling =