CONTRIB: debug: teach the "flags" utility about new conn_stream flags

CS_FL_ERR_PENDING and CS_FL_WANT_ROOM were not added.
diff --git a/contrib/debug/flags.c b/contrib/debug/flags.c
index 6c57143..6e95684 100644
--- a/contrib/debug/flags.c
+++ b/contrib/debug/flags.c
@@ -160,6 +160,8 @@
 	SHOW_FLAG(f, CS_FL_WAIT_FOR_HS);
 	SHOW_FLAG(f, CS_FL_REOS);
 	SHOW_FLAG(f, CS_FL_EOS);
+	SHOW_FLAG(f, CS_FL_ERR_PENDING);
+	SHOW_FLAG(f, CS_FL_WANT_ROOM);
 	SHOW_FLAG(f, CS_FL_RCV_MORE);
 	SHOW_FLAG(f, CS_FL_ERROR);
 	SHOW_FLAG(f, CS_FL_SHWS);