Remove spurious assert in skip_sgr

Change-Id: I30a914511b0082014b2fb2a3de23518f8faa8e73
diff --git a/av1/encoder/bitstream.c b/av1/encoder/bitstream.c
index 21a7b9e..b4058fa 100644
--- a/av1/encoder/bitstream.c
+++ b/av1/encoder/bitstream.c
@@ -2192,7 +2192,6 @@
         wb, SGRPROJ_PRJ_MAX0 - SGRPROJ_PRJ_MIN0 + 1, SGRPROJ_PRJ_SUBEXP_K,
         ref_sgrproj_info->xqd[0] - SGRPROJ_PRJ_MIN0,
         sgrproj_info->xqd[0] - SGRPROJ_PRJ_MIN0);
-    assert(sgrproj_info->xqd[1] == 0);
   } else {
     aom_write_primitive_refsubexpfin(
         wb, SGRPROJ_PRJ_MAX0 - SGRPROJ_PRJ_MIN0 + 1, SGRPROJ_PRJ_SUBEXP_K,