rtc-screen: Enable estimate_motion_part for svc

Enable estimate_motion_for_var_based_partition
for svc mode. This improves quality for temporal
layers for scrolling content.

bdrate/speed on rtc_screen for 2TL 65/35 split:
ovr/avg/ssim, IC i%speedup
-0.6/-0.8/-0.9, 2

On buganizer clip, which has scrolling:
-4.5/-6.1/-6.1, 6.3

Change-Id: Ief3c68146567f9fdb8b6dc6d7b336ed3c1dc3504

av1/encoder/speed_features.c

diff --git a/av1/encoder/speed_features.c b/av1/encoder/speed_features.c
index 47abbc9..6b18775 100644
--- a/av1/encoder/speed_features.c
+++ b/av1/encoder/speed_features.c
@@ -1584,8 +1584,8 @@
     }
     sf->rt_sf.partition_direct_merging = 0;
     sf->hl_sf.accurate_bit_estimate = 0;
-    // This feature is for nonrd_pickmode and  non-svc for now.
-    if (sf->rt_sf.use_nonrd_pick_mode && !cpi->ppi->use_svc)
+    // This feature is for nonrd_pickmode.
+    if (sf->rt_sf.use_nonrd_pick_mode)
       sf->rt_sf.estimate_motion_for_var_based_partition = 1;
     else
       sf->rt_sf.estimate_motion_for_var_based_partition = 0;