[seg] No need to decide temporal_update

If error resilient mode is true, temporal update of seg_id is not used,
thus don't need to decide seg->temporal_update flag by calling
av1_choose_segmap_coding_method().

Change-Id: Ifb2271be53f1a6bc64f1196af5e7fbe46741fab0
diff --git a/av1/encoder/bitstream.c b/av1/encoder/bitstream.c
index 1f2a33c..05df695 100644
--- a/av1/encoder/bitstream.c
+++ b/av1/encoder/bitstream.c
@@ -2462,7 +2462,7 @@
   }
   if (seg->update_map) {
     // Select the coding strategy (temporal or spatial)
-    av1_choose_segmap_coding_method(cm, xd);
+    if (!cm->error_resilient_mode) av1_choose_segmap_coding_method(cm, xd);
 
     // Write out the chosen coding method.
     if (!frame_is_intra_only(cm) && !cm->error_resilient_mode) {