MINOR: stconn: Always report READ/WRITE event on shutr/shutw

It was done by hand by callers when a shutdown for read or write was
performed. It is now always handled by the functions performing the
shutdown. This way the callers don't take care of it. This will avoid some
bugs.
diff --git a/src/stats.c b/src/stats.c
index 4ee8e86..d9bb367 100644
--- a/src/stats.c
+++ b/src/stats.c
@@ -4506,10 +4506,8 @@
 	}
 
 	if (appctx->st0 == STAT_HTTP_END) {
-		if (!(res->flags & CF_SHUTR)) {
-			res->flags |= CF_READ_EVENT;
+		if (!(res->flags & CF_SHUTR))
 			sc_shutr(sc);
-		}
 
 		/* eat the whole request */
 		if (co_data(req)) {