Fix bug in adaptive_interp_filter_search

skip_pred flag is not updated when inter filter
is skipped for adaptive_interp_filter_search

Speed impact is negligible, verified across
multiple presets

STATS_CHANGED

Change-Id: Ifde060a66fcef09940bc1ecebc03b674ab5cdebf
diff --git a/av1/encoder/rdopt.c b/av1/encoder/rdopt.c
index f0bc0b5..d8436d2 100644
--- a/av1/encoder/rdopt.c
+++ b/av1/encoder/rdopt.c
@@ -8464,6 +8464,7 @@
              filter_sets[i].as_filters.y_filter);
       if (cpi->sf.adaptive_interp_filter_search &&
           (cpi->sf.interp_filter_search_mask & (1 << (i >> 2)))) {
+        skip_pred = (skip_hor & skip_ver);
         continue;
       }
       interpolation_filter_rd(