Remove Frame_ID_NUMBERS_PRESENT_FLAG

This commit replaces hard coded FRAME_ID_NUMBERS_PRESENT_FLAG with
error_resilient_mode, which properly reflects the intention of the
experiment, i.e. "signal the complete state of the reference buffer
explicitly for each frame" to deal with possible frame losses.

Change-Id: I7130c110d26c6a8e1cf1266c05482b768cf352f9
diff --git a/av1/encoder/bitstream.c b/av1/encoder/bitstream.c
index 102cd23..418c22e 100644
--- a/av1/encoder/bitstream.c
+++ b/av1/encoder/bitstream.c
@@ -3316,7 +3316,7 @@
 #if CONFIG_EXT_TILE
       cm->large_scale_tile ? 0 :
 #endif  // CONFIG_EXT_TILE
-                           FRAME_ID_NUMBERS_PRESENT_FLAG;
+                           cm->error_resilient_mode;
   seq_params->frame_id_length = FRAME_ID_LENGTH;
   seq_params->delta_frame_id_length = DELTA_FRAME_ID_LENGTH;